Why dhclient is still running when I choose static IP?Is there a safe way to disable DHCP from command line?How to add an IP alias on a bridged interface?Not able to connect to local networkConnecting Two Computers Together: Assigning IP doesnt workSetting Internet GatewayUbuntu server can access internet but cannot ping systems in the LANUnable to run 2 ethernet connections at the same timeConflict between two network interfaces eth0 and eth114.04 no internet connection when I up the bridge interface (for LXC container)Multiple network on the same cardReconfiguring the network interface on Ubuntu Server 16.04
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Why dhclient is still running when I choose static IP?
Is there a safe way to disable DHCP from command line?How to add an IP alias on a bridged interface?Not able to connect to local networkConnecting Two Computers Together: Assigning IP doesnt workSetting Internet GatewayUbuntu server can access internet but cannot ping systems in the LANUnable to run 2 ethernet connections at the same timeConflict between two network interfaces eth0 and eth114.04 no internet connection when I up the bridge interface (for LXC container)Multiple network on the same cardReconfiguring the network interface on Ubuntu Server 16.04
I modify dhcp to static in /etc/network/interfaces (like below).
# The primary network interface
auto eth0
iface eth0 inet static
netmask 255.255.0.0
address 10.10.130.128
gateway 10.10.1.1
Then restart the interface.
$ sudo ifdown eth0; sudo ifup eth0
...
$ ifconfig
eth0 Link encap:Ethernet
inet addr:10.10.130.128 Bcast:10.10.255.255 Mask:255.255.0.0
So the new address kicks in.
But DHCP is still there?
$ ps aux | grep dhc
root ... dhclient3 -e IF_METRIC=100 -pf /var/run/dhclient.eth0.pid -lf /var/lib/dhcp/dhclient.eth0.leases -1 eth0
Is that normal? If not, how to restart interface in static IP while stop DHCP at the same time?
Thanks a lot.
networking dhcp
asked May 1 '14 at 20:09
user276851user276851
2872515
add a comment |
I modify dhcp to static in /etc/network/interfaces (like below).
# The primary network interface
auto eth0
iface eth0 inet static
netmask 255.255.0.0
address 10.10.130.128
gateway 10.10.1.1
Then restart the interface.
$ sudo ifdown eth0; sudo ifup eth0
...
$ ifconfig
eth0 Link encap:Ethernet
inet addr:10.10.130.128 Bcast:10.10.255.255 Mask:255.255.0.0
So the new address kicks in.
But DHCP is still there?
$ ps aux | grep dhc
root ... dhclient3 -e IF_METRIC=100 -pf /var/run/dhclient.eth0.pid -lf /var/lib/dhcp/dhclient.eth0.leases -1 eth0
Is that normal? If not, how to restart interface in static IP while stop DHCP at the same time?
Thanks a lot.
networking dhcp
asked May 1 '14 at 20:09
user276851user276851
2872515
2
Possible duplicate of Is there a safe way to disable DHCP from command line?
– Videonauth
Nov 15 '17 at 16:07
add a comment |
I modify dhcp to static in /etc/network/interfaces (like below).
# The primary network interface
auto eth0
iface eth0 inet static
netmask 255.255.0.0
address 10.10.130.128
gateway 10.10.1.1
Then restart the interface.
$ sudo ifdown eth0; sudo ifup eth0
...
$ ifconfig
eth0 Link encap:Ethernet
inet addr:10.10.130.128 Bcast:10.10.255.255 Mask:255.255.0.0
So the new address kicks in.
But DHCP is still there?
$ ps aux | grep dhc
root ... dhclient3 -e IF_METRIC=100 -pf /var/run/dhclient.eth0.pid -lf /var/lib/dhcp/dhclient.eth0.leases -1 eth0
Is that normal? If not, how to restart interface in static IP while stop DHCP at the same time?
Thanks a lot.
networking dhcp
asked May 1 '14 at 20:09
user276851user276851
2872515
I modify dhcp to static in /etc/network/interfaces (like below).
# The primary network interface
auto eth0
iface eth0 inet static
netmask 255.255.0.0
address 10.10.130.128
gateway 10.10.1.1
Then restart the interface.
$ sudo ifdown eth0; sudo ifup eth0
...
$ ifconfig
eth0 Link encap:Ethernet
inet addr:10.10.130.128 Bcast:10.10.255.255 Mask:255.255.0.0
So the new address kicks in.
But DHCP is still there?
$ ps aux | grep dhc
root ... dhclient3 -e IF_METRIC=100 -pf /var/run/dhclient.eth0.pid -lf /var/lib/dhcp/dhclient.eth0.leases -1 eth0
Is that normal? If not, how to restart interface in static IP while stop DHCP at the same time?
Thanks a lot.
networking dhcp
networking dhcp
asked May 1 '14 at 20:09
user276851user276851
2872515
asked May 1 '14 at 20:09
user276851user276851
2872515
asked May 1 '14 at 20:09
user276851user276851
2872515
asked May 1 '14 at 20:09
user276851user276851
2872515
asked May 1 '14 at 20:09
user276851user276851
2872515
2872515
2
Possible duplicate of Is there a safe way to disable DHCP from command line?
– Videonauth
Nov 15 '17 at 16:07
add a comment |
2
Possible duplicate of Is there a safe way to disable DHCP from command line?
– Videonauth
Nov 15 '17 at 16:07
2
2
Possible duplicate of Is there a safe way to disable DHCP from command line?
– Videonauth
Nov 15 '17 at 16:07
Possible duplicate of Is there a safe way to disable DHCP from command line?
– Videonauth
Nov 15 '17 at 16:07
add a comment |
3 Answers
3
active
oldest
votes
- You first have to shutdown the interface (in dhcp mode)
sudo ifdown eth0 Then edit the config
nano /etc/network/interfaces# The primary network interface
auto eth0
iface eth0 inet static
netmask 255.255.0.0
address 10.10.130.128
gateway 10.10.1.1Bring the interface back up
sudo ifup eth0
Otherwise dhclient doesn't correctly shuts down,
answered May 1 '14 at 20:24
pvcpvc
32625
Sorry, but can someone elaborate on exactly how this differs from what is done in the OP here? I've read this three times and I can't seem to tell the difference.
– fostandy
Aug 16 '14 at 10:37
Is it about modifying ('touch') the file so the date changes? Am I supposed to only edit the file AFTER I've brought down the interface? If so, how can I 'undo' the fact that I've edited it before?
– fostandy
Aug 16 '14 at 10:43
1
@fostandy "ifupdown doesn't support the modifying of interface definitions in /etc/network/interfaces while the related interfaces are up". Here, the interface is stopped before the file is modified.
– Bruno
Nov 15 '14 at 0:14
1
@Bruno - thanks for clarifying. Out of curiousity what do you do if you've already irrevocably edited the/etc/network/interfacesfile? Is there a way to force a reset to defaults and and start again?
– fostandy
Dec 1 '14 at 8:22
7
I was baffled as to why it should make a difference but then a clever friend of mine explained it very nicely. The problem is if the file is edited and thenifdownis run, network manager does not know that it needs to stopdhclient, since all it sees in theinterfacesfile is a static entry. After, the interface is down, issuingifupcorrectly reads and applies the static settings, but it also doesn't know thatdhclienthad been started.
– paracycle
Oct 23 '15 at 18:48
|
show 3 more comments
I had the same issue (Ubuntu 16.04). However, this was a cloud instance and I could not ifdown the interface that easily.
Short answer: I removed the file /etc/network/interfaces.d/50-cloud-init.cfg ifup was triggered by that specific file.
Long answer:
I configured the interface using the /etc/network/interfaces with a static IP address, but I still found in the daemon.log that dhclient was still requesting IP's from the DHCP and dhclient was started through systemd.
Specifically, systemd called the networking.service unit, which called ifup, which read both the interfaces file and the 50-cloud-init.cfg file. Resulting in some conflicts, but still a functional network.
edited 6 mins ago
Kevin Bowen
14.6k155970
answered Apr 20 '17 at 17:36
Patrick DeelmanPatrick Deelman
211
I had the exact same issue, and learned the hard way, that a later file (like 99-eth0.cfg) was indeed NOT overriding previous statements! So, thanks for your input ;)
– Daywalker
Mar 20 '18 at 18:17
add a comment |
I found for me, this was due to gnome's NetworkManager still running and thinking it was in charge of the device. In hindsight this should have been obvious as ps showed dhclient was being launched by NetworkManager.
Once I restarted my system the device went to "unmanaged" in NetworkManager and it stopped trying to configure it. Perhaps I could have achieved the same thing just by stopping/restarting NetworkManager, I'm not sure.
answered Aug 19 '14 at 2:54
fostandyfostandy
1111
add a comment |
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3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
- You first have to shutdown the interface (in dhcp mode)
sudo ifdown eth0 Then edit the config
nano /etc/network/interfaces# The primary network interface
auto eth0
iface eth0 inet static
netmask 255.255.0.0
address 10.10.130.128
gateway 10.10.1.1Bring the interface back up
sudo ifup eth0
Otherwise dhclient doesn't correctly shuts down,
answered May 1 '14 at 20:24
pvcpvc
32625
Sorry, but can someone elaborate on exactly how this differs from what is done in the OP here? I've read this three times and I can't seem to tell the difference.
– fostandy
Aug 16 '14 at 10:37
Is it about modifying ('touch') the file so the date changes? Am I supposed to only edit the file AFTER I've brought down the interface? If so, how can I 'undo' the fact that I've edited it before?
– fostandy
Aug 16 '14 at 10:43
1
@fostandy "ifupdown doesn't support the modifying of interface definitions in /etc/network/interfaces while the related interfaces are up". Here, the interface is stopped before the file is modified.
– Bruno
Nov 15 '14 at 0:14
1
@Bruno - thanks for clarifying. Out of curiousity what do you do if you've already irrevocably edited the/etc/network/interfacesfile? Is there a way to force a reset to defaults and and start again?
– fostandy
Dec 1 '14 at 8:22
7
I was baffled as to why it should make a difference but then a clever friend of mine explained it very nicely. The problem is if the file is edited and thenifdownis run, network manager does not know that it needs to stopdhclient, since all it sees in theinterfacesfile is a static entry. After, the interface is down, issuingifupcorrectly reads and applies the static settings, but it also doesn't know thatdhclienthad been started.
– paracycle
Oct 23 '15 at 18:48
|
show 3 more comments
- You first have to shutdown the interface (in dhcp mode)
sudo ifdown eth0 Then edit the config
nano /etc/network/interfaces# The primary network interface
auto eth0
iface eth0 inet static
netmask 255.255.0.0
address 10.10.130.128
gateway 10.10.1.1Bring the interface back up
sudo ifup eth0
Otherwise dhclient doesn't correctly shuts down,
answered May 1 '14 at 20:24
pvcpvc
32625
Sorry, but can someone elaborate on exactly how this differs from what is done in the OP here? I've read this three times and I can't seem to tell the difference.
– fostandy
Aug 16 '14 at 10:37
Is it about modifying ('touch') the file so the date changes? Am I supposed to only edit the file AFTER I've brought down the interface? If so, how can I 'undo' the fact that I've edited it before?
– fostandy
Aug 16 '14 at 10:43
1
@fostandy "ifupdown doesn't support the modifying of interface definitions in /etc/network/interfaces while the related interfaces are up". Here, the interface is stopped before the file is modified.
– Bruno
Nov 15 '14 at 0:14
1
@Bruno - thanks for clarifying. Out of curiousity what do you do if you've already irrevocably edited the/etc/network/interfacesfile? Is there a way to force a reset to defaults and and start again?
– fostandy
Dec 1 '14 at 8:22
7
I was baffled as to why it should make a difference but then a clever friend of mine explained it very nicely. The problem is if the file is edited and thenifdownis run, network manager does not know that it needs to stopdhclient, since all it sees in theinterfacesfile is a static entry. After, the interface is down, issuingifupcorrectly reads and applies the static settings, but it also doesn't know thatdhclienthad been started.
– paracycle
Oct 23 '15 at 18:48
|
show 3 more comments
- You first have to shutdown the interface (in dhcp mode)
sudo ifdown eth0 Then edit the config
nano /etc/network/interfaces# The primary network interface
auto eth0
iface eth0 inet static
netmask 255.255.0.0
address 10.10.130.128
gateway 10.10.1.1Bring the interface back up
sudo ifup eth0
Otherwise dhclient doesn't correctly shuts down,
answered May 1 '14 at 20:24
pvcpvc
32625
- You first have to shutdown the interface (in dhcp mode)
sudo ifdown eth0 Then edit the config
nano /etc/network/interfaces# The primary network interface
auto eth0
iface eth0 inet static
netmask 255.255.0.0
address 10.10.130.128
gateway 10.10.1.1Bring the interface back up
sudo ifup eth0
Otherwise dhclient doesn't correctly shuts down,
answered May 1 '14 at 20:24
pvcpvc
32625
edited May 1 '14 at 21:27
answered May 1 '14 at 20:24
pvcpvc
32625
answered May 1 '14 at 20:24
pvcpvc
32625
answered May 1 '14 at 20:24
pvcpvc
32625
32625
Sorry, but can someone elaborate on exactly how this differs from what is done in the OP here? I've read this three times and I can't seem to tell the difference.
– fostandy
Aug 16 '14 at 10:37
Is it about modifying ('touch') the file so the date changes? Am I supposed to only edit the file AFTER I've brought down the interface? If so, how can I 'undo' the fact that I've edited it before?
– fostandy
Aug 16 '14 at 10:43
1
@fostandy "ifupdown doesn't support the modifying of interface definitions in /etc/network/interfaces while the related interfaces are up". Here, the interface is stopped before the file is modified.
– Bruno
Nov 15 '14 at 0:14
1
@Bruno - thanks for clarifying. Out of curiousity what do you do if you've already irrevocably edited the/etc/network/interfacesfile? Is there a way to force a reset to defaults and and start again?
– fostandy
Dec 1 '14 at 8:22
7
I was baffled as to why it should make a difference but then a clever friend of mine explained it very nicely. The problem is if the file is edited and thenifdownis run, network manager does not know that it needs to stopdhclient, since all it sees in theinterfacesfile is a static entry. After, the interface is down, issuingifupcorrectly reads and applies the static settings, but it also doesn't know thatdhclienthad been started.
– paracycle
Oct 23 '15 at 18:48
|
show 3 more comments
Sorry, but can someone elaborate on exactly how this differs from what is done in the OP here? I've read this three times and I can't seem to tell the difference.
– fostandy
Aug 16 '14 at 10:37
Is it about modifying ('touch') the file so the date changes? Am I supposed to only edit the file AFTER I've brought down the interface? If so, how can I 'undo' the fact that I've edited it before?
– fostandy
Aug 16 '14 at 10:43
1
@fostandy "ifupdown doesn't support the modifying of interface definitions in /etc/network/interfaces while the related interfaces are up". Here, the interface is stopped before the file is modified.
– Bruno
Nov 15 '14 at 0:14
1
@Bruno - thanks for clarifying. Out of curiousity what do you do if you've already irrevocably edited the/etc/network/interfacesfile? Is there a way to force a reset to defaults and and start again?
– fostandy
Dec 1 '14 at 8:22
7
I was baffled as to why it should make a difference but then a clever friend of mine explained it very nicely. The problem is if the file is edited and thenifdownis run, network manager does not know that it needs to stopdhclient, since all it sees in theinterfacesfile is a static entry. After, the interface is down, issuingifupcorrectly reads and applies the static settings, but it also doesn't know thatdhclienthad been started.
– paracycle
Oct 23 '15 at 18:48
Sorry, but can someone elaborate on exactly how this differs from what is done in the OP here? I've read this three times and I can't seem to tell the difference.
– fostandy
Aug 16 '14 at 10:37
Sorry, but can someone elaborate on exactly how this differs from what is done in the OP here? I've read this three times and I can't seem to tell the difference.
– fostandy
Aug 16 '14 at 10:37
Is it about modifying ('touch') the file so the date changes? Am I supposed to only edit the file AFTER I've brought down the interface? If so, how can I 'undo' the fact that I've edited it before?
– fostandy
Aug 16 '14 at 10:43
Is it about modifying ('touch') the file so the date changes? Am I supposed to only edit the file AFTER I've brought down the interface? If so, how can I 'undo' the fact that I've edited it before?
– fostandy
Aug 16 '14 at 10:43
1
1
@fostandy "ifupdown doesn't support the modifying of interface definitions in /etc/network/interfaces while the related interfaces are up". Here, the interface is stopped before the file is modified.
– Bruno
Nov 15 '14 at 0:14
@fostandy "ifupdown doesn't support the modifying of interface definitions in /etc/network/interfaces while the related interfaces are up". Here, the interface is stopped before the file is modified.
– Bruno
Nov 15 '14 at 0:14
1
1
@Bruno - thanks for clarifying. Out of curiousity what do you do if you've already irrevocably edited the
/etc/network/interfaces file? Is there a way to force a reset to defaults and and start again?– fostandy
Dec 1 '14 at 8:22
@Bruno - thanks for clarifying. Out of curiousity what do you do if you've already irrevocably edited the
/etc/network/interfaces file? Is there a way to force a reset to defaults and and start again?– fostandy
Dec 1 '14 at 8:22
7
7
I was baffled as to why it should make a difference but then a clever friend of mine explained it very nicely. The problem is if the file is edited and then
ifdown is run, network manager does not know that it needs to stop dhclient, since all it sees in the interfaces file is a static entry. After, the interface is down, issuing ifup correctly reads and applies the static settings, but it also doesn't know that dhclient had been started.– paracycle
Oct 23 '15 at 18:48
I was baffled as to why it should make a difference but then a clever friend of mine explained it very nicely. The problem is if the file is edited and then
ifdown is run, network manager does not know that it needs to stop dhclient, since all it sees in the interfaces file is a static entry. After, the interface is down, issuing ifup correctly reads and applies the static settings, but it also doesn't know that dhclient had been started.– paracycle
Oct 23 '15 at 18:48
|
show 3 more comments
I had the same issue (Ubuntu 16.04). However, this was a cloud instance and I could not ifdown the interface that easily.
Short answer: I removed the file /etc/network/interfaces.d/50-cloud-init.cfg ifup was triggered by that specific file.
Long answer:
I configured the interface using the /etc/network/interfaces with a static IP address, but I still found in the daemon.log that dhclient was still requesting IP's from the DHCP and dhclient was started through systemd.
Specifically, systemd called the networking.service unit, which called ifup, which read both the interfaces file and the 50-cloud-init.cfg file. Resulting in some conflicts, but still a functional network.
edited 6 mins ago
Kevin Bowen
14.6k155970
answered Apr 20 '17 at 17:36
Patrick DeelmanPatrick Deelman
211
I had the exact same issue, and learned the hard way, that a later file (like 99-eth0.cfg) was indeed NOT overriding previous statements! So, thanks for your input ;)
– Daywalker
Mar 20 '18 at 18:17
add a comment |
I had the same issue (Ubuntu 16.04). However, this was a cloud instance and I could not ifdown the interface that easily.
Short answer: I removed the file /etc/network/interfaces.d/50-cloud-init.cfg ifup was triggered by that specific file.
Long answer:
I configured the interface using the /etc/network/interfaces with a static IP address, but I still found in the daemon.log that dhclient was still requesting IP's from the DHCP and dhclient was started through systemd.
Specifically, systemd called the networking.service unit, which called ifup, which read both the interfaces file and the 50-cloud-init.cfg file. Resulting in some conflicts, but still a functional network.
edited 6 mins ago
Kevin Bowen
14.6k155970
answered Apr 20 '17 at 17:36
Patrick DeelmanPatrick Deelman
211
I had the exact same issue, and learned the hard way, that a later file (like 99-eth0.cfg) was indeed NOT overriding previous statements! So, thanks for your input ;)
– Daywalker
Mar 20 '18 at 18:17
add a comment |
I had the same issue (Ubuntu 16.04). However, this was a cloud instance and I could not ifdown the interface that easily.
Short answer: I removed the file /etc/network/interfaces.d/50-cloud-init.cfg ifup was triggered by that specific file.
Long answer:
I configured the interface using the /etc/network/interfaces with a static IP address, but I still found in the daemon.log that dhclient was still requesting IP's from the DHCP and dhclient was started through systemd.
Specifically, systemd called the networking.service unit, which called ifup, which read both the interfaces file and the 50-cloud-init.cfg file. Resulting in some conflicts, but still a functional network.
edited 6 mins ago
Kevin Bowen
14.6k155970
answered Apr 20 '17 at 17:36
Patrick DeelmanPatrick Deelman
211
I had the same issue (Ubuntu 16.04). However, this was a cloud instance and I could not ifdown the interface that easily.
Short answer: I removed the file /etc/network/interfaces.d/50-cloud-init.cfg ifup was triggered by that specific file.
Long answer:
I configured the interface using the /etc/network/interfaces with a static IP address, but I still found in the daemon.log that dhclient was still requesting IP's from the DHCP and dhclient was started through systemd.
Specifically, systemd called the networking.service unit, which called ifup, which read both the interfaces file and the 50-cloud-init.cfg file. Resulting in some conflicts, but still a functional network.
edited 6 mins ago
Kevin Bowen
14.6k155970
answered Apr 20 '17 at 17:36
Patrick DeelmanPatrick Deelman
211
edited 6 mins ago
Kevin Bowen
14.6k155970
edited 6 mins ago
Kevin Bowen
14.6k155970
edited 6 mins ago
Kevin Bowen
14.6k155970
14.6k155970
answered Apr 20 '17 at 17:36
Patrick DeelmanPatrick Deelman
211
answered Apr 20 '17 at 17:36
Patrick DeelmanPatrick Deelman
211
answered Apr 20 '17 at 17:36
Patrick DeelmanPatrick Deelman
211
211
I had the exact same issue, and learned the hard way, that a later file (like 99-eth0.cfg) was indeed NOT overriding previous statements! So, thanks for your input ;)
– Daywalker
Mar 20 '18 at 18:17
add a comment |
I had the exact same issue, and learned the hard way, that a later file (like 99-eth0.cfg) was indeed NOT overriding previous statements! So, thanks for your input ;)
– Daywalker
Mar 20 '18 at 18:17
I had the exact same issue, and learned the hard way, that a later file (like 99-eth0.cfg) was indeed NOT overriding previous statements! So, thanks for your input ;)
– Daywalker
Mar 20 '18 at 18:17
I had the exact same issue, and learned the hard way, that a later file (like 99-eth0.cfg) was indeed NOT overriding previous statements! So, thanks for your input ;)
– Daywalker
Mar 20 '18 at 18:17
add a comment |
I found for me, this was due to gnome's NetworkManager still running and thinking it was in charge of the device. In hindsight this should have been obvious as ps showed dhclient was being launched by NetworkManager.
Once I restarted my system the device went to "unmanaged" in NetworkManager and it stopped trying to configure it. Perhaps I could have achieved the same thing just by stopping/restarting NetworkManager, I'm not sure.
answered Aug 19 '14 at 2:54
fostandyfostandy
1111
add a comment |
I found for me, this was due to gnome's NetworkManager still running and thinking it was in charge of the device. In hindsight this should have been obvious as ps showed dhclient was being launched by NetworkManager.
Once I restarted my system the device went to "unmanaged" in NetworkManager and it stopped trying to configure it. Perhaps I could have achieved the same thing just by stopping/restarting NetworkManager, I'm not sure.
answered Aug 19 '14 at 2:54
fostandyfostandy
1111
add a comment |
I found for me, this was due to gnome's NetworkManager still running and thinking it was in charge of the device. In hindsight this should have been obvious as ps showed dhclient was being launched by NetworkManager.
Once I restarted my system the device went to "unmanaged" in NetworkManager and it stopped trying to configure it. Perhaps I could have achieved the same thing just by stopping/restarting NetworkManager, I'm not sure.
answered Aug 19 '14 at 2:54
fostandyfostandy
1111
I found for me, this was due to gnome's NetworkManager still running and thinking it was in charge of the device. In hindsight this should have been obvious as ps showed dhclient was being launched by NetworkManager.
Once I restarted my system the device went to "unmanaged" in NetworkManager and it stopped trying to configure it. Perhaps I could have achieved the same thing just by stopping/restarting NetworkManager, I'm not sure.
answered Aug 19 '14 at 2:54
fostandyfostandy
1111
answered Aug 19 '14 at 2:54
fostandyfostandy
1111
answered Aug 19 '14 at 2:54
fostandyfostandy
1111
answered Aug 19 '14 at 2:54
fostandyfostandy
1111
1111
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Possible duplicate of Is there a safe way to disable DHCP from command line?
– Videonauth
Nov 15 '17 at 16:07