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Disable dhcp client over one interface

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3

I'm encountering a problem on a sever with two ethernet interfaces(etho and eth1), it runs linux-ubuntu-server.
I need eth1 not make any dhcp request, becouse I need it to be only a listening interface, obviusly I need eth0 running normally.
So how can i disable any dhcpclient ation over eth1?

thank in advance.

linux networking ubuntu dhcp

share|improve this question

asked Jun 4 '10 at 9:00

LopocLopoc

141114

migrated from stackoverflow.com Jun 5 '10 at 6:17

This question came from our site for professional and enthusiast programmers.

add a comment | 

3

I'm encountering a problem on a sever with two ethernet interfaces(etho and eth1), it runs linux-ubuntu-server.
I need eth1 not make any dhcp request, becouse I need it to be only a listening interface, obviusly I need eth0 running normally.
So how can i disable any dhcpclient ation over eth1?

thank in advance.

linux networking ubuntu dhcp

share|improve this question

asked Jun 4 '10 at 9:00

LopocLopoc

141114

migrated from stackoverflow.com Jun 5 '10 at 6:17

This question came from our site for professional and enthusiast programmers.

add a comment | 

I'm encountering a problem on a sever with two ethernet interfaces(etho and eth1), it runs linux-ubuntu-server.
I need eth1 not make any dhcp request, becouse I need it to be only a listening interface, obviusly I need eth0 running normally.
So how can i disable any dhcpclient ation over eth1?

thank in advance.

linux networking ubuntu dhcp

share|improve this question

asked Jun 4 '10 at 9:00

LopocLopoc

141114

share|improve this question

asked Jun 4 '10 at 9:00

LopocLopoc

141114

share|improve this question

asked Jun 4 '10 at 9:00

LopocLopoc

141114

asked Jun 4 '10 at 9:00

LopocLopoc

141114

asked Jun 4 '10 at 9:00

LopocLopoc

141114

3 Answers
3

active

oldest

votes

4

Something like:

auto lo eth0 eth1



iface lo inet loopback



iface eth1 inet static

        address 192.168.32.130

        netmask 255.255.255.0

        gateway 192.168.32.1

in your /etc/network/interfaces config file will assign your eth1 a static IP address.

share|improve this answer

answered Jun 4 '10 at 9:06

Yasir ArsanukaevYasir Arsanukaev

1814

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I need eth1 to be mute, no IP at all, probably i could set in /etc/network/interfaces address to 0.0.0.0
  
  – Lopoc
  Jun 4 '10 at 9:15
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  @Lopoc: If you want eth1 to be disabled completely, you may try to leave only interfaces you need to be up in /etc/network/interfaces: auto lo eth0. If you want your interface to reject all incoming connections you may use iptables, ipfw.
  
  – Yasir Arsanukaev
  Jun 4 '10 at 9:36
  

  
  
  
  

add a comment | 

1

Sometimes even with correct /etc/network/interfaces file, dhclient continues to request IP addresses on static interfaces. The problem might be the existence of old /var/lib/dhcp/dhclient.*.leases files with incorrect information. Just kill dhclient, remove those files, and start it anew (by doing ifdown/ifup on DHCP interfaces).

share|improve this answer

edited Jul 27 '17 at 15:30

Cory Knutson

1,746719

answered Jul 26 '17 at 11:53

lvdlvd

1112

add a comment | 

0

if you don't want to add a static ip on this interface, maybe you have to delete the IP assigned by DHCP client.

Running this script will remove the ip on eth0.

#!/bin/sh

localip=`ip addr list dev eth0 | grep "inet " | sed 's/(^s*inets)([0-9.]*)([s/].*)/2/'`

if [[$ip != ""]]; then

sudo ip addr del $localip dev eth0

fi

You need to run it manually or set it into crontab. Or, try to call it after IP assigned, but I don't know how to hook that.

share|improve this answer

answered 17 mins ago

sceggscegg

1011

New contributor

scegg is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

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4

Something like:

auto lo eth0 eth1



iface lo inet loopback



iface eth1 inet static

        address 192.168.32.130

        netmask 255.255.255.0

        gateway 192.168.32.1

in your /etc/network/interfaces config file will assign your eth1 a static IP address.

share|improve this answer

answered Jun 4 '10 at 9:06

Yasir ArsanukaevYasir Arsanukaev

1814

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I need eth1 to be mute, no IP at all, probably i could set in /etc/network/interfaces address to 0.0.0.0
  
  – Lopoc
  Jun 4 '10 at 9:15
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  @Lopoc: If you want eth1 to be disabled completely, you may try to leave only interfaces you need to be up in /etc/network/interfaces: auto lo eth0. If you want your interface to reject all incoming connections you may use iptables, ipfw.
  
  – Yasir Arsanukaev
  Jun 4 '10 at 9:36
  

  
  
  
  

add a comment | 

4

Something like:

auto lo eth0 eth1



iface lo inet loopback



iface eth1 inet static

        address 192.168.32.130

        netmask 255.255.255.0

        gateway 192.168.32.1

in your /etc/network/interfaces config file will assign your eth1 a static IP address.

share|improve this answer

answered Jun 4 '10 at 9:06

Yasir ArsanukaevYasir Arsanukaev

1814

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I need eth1 to be mute, no IP at all, probably i could set in /etc/network/interfaces address to 0.0.0.0
  
  – Lopoc
  Jun 4 '10 at 9:15
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  @Lopoc: If you want eth1 to be disabled completely, you may try to leave only interfaces you need to be up in /etc/network/interfaces: auto lo eth0. If you want your interface to reject all incoming connections you may use iptables, ipfw.
  
  – Yasir Arsanukaev
  Jun 4 '10 at 9:36
  

  
  
  
  

add a comment | 

Something like:

auto lo eth0 eth1



iface lo inet loopback



iface eth1 inet static

        address 192.168.32.130

        netmask 255.255.255.0

        gateway 192.168.32.1

in your /etc/network/interfaces config file will assign your eth1 a static IP address.

share|improve this answer

answered Jun 4 '10 at 9:06

Yasir ArsanukaevYasir Arsanukaev

1814

auto lo eth0 eth1



iface lo inet loopback



iface eth1 inet static

        address 192.168.32.130

        netmask 255.255.255.0

        gateway 192.168.32.1

share|improve this answer

answered Jun 4 '10 at 9:06

Yasir ArsanukaevYasir Arsanukaev

1814

answered Jun 4 '10 at 9:06

Yasir ArsanukaevYasir Arsanukaev

1814

answered Jun 4 '10 at 9:06

Yasir ArsanukaevYasir Arsanukaev

1814

1

Sometimes even with correct /etc/network/interfaces file, dhclient continues to request IP addresses on static interfaces. The problem might be the existence of old /var/lib/dhcp/dhclient.*.leases files with incorrect information. Just kill dhclient, remove those files, and start it anew (by doing ifdown/ifup on DHCP interfaces).

share|improve this answer

edited Jul 27 '17 at 15:30

Cory Knutson

1,746719

answered Jul 26 '17 at 11:53

lvdlvd

1112

add a comment | 

1

Sometimes even with correct /etc/network/interfaces file, dhclient continues to request IP addresses on static interfaces. The problem might be the existence of old /var/lib/dhcp/dhclient.*.leases files with incorrect information. Just kill dhclient, remove those files, and start it anew (by doing ifdown/ifup on DHCP interfaces).

share|improve this answer

edited Jul 27 '17 at 15:30

Cory Knutson

1,746719

answered Jul 26 '17 at 11:53

lvdlvd

1112

add a comment | 

Sometimes even with correct /etc/network/interfaces file, dhclient continues to request IP addresses on static interfaces. The problem might be the existence of old /var/lib/dhcp/dhclient.*.leases files with incorrect information. Just kill dhclient, remove those files, and start it anew (by doing ifdown/ifup on DHCP interfaces).

share|improve this answer

edited Jul 27 '17 at 15:30

Cory Knutson

1,746719

answered Jul 26 '17 at 11:53

lvdlvd

1112

share|improve this answer

edited Jul 27 '17 at 15:30

Cory Knutson

1,746719

answered Jul 26 '17 at 11:53

lvdlvd

1112

edited Jul 27 '17 at 15:30

Cory Knutson

1,746719

edited Jul 27 '17 at 15:30

Cory Knutson

1,746719

answered Jul 26 '17 at 11:53

lvdlvd

1112

answered Jul 26 '17 at 11:53

lvdlvd

1112

0

if you don't want to add a static ip on this interface, maybe you have to delete the IP assigned by DHCP client.

Running this script will remove the ip on eth0.

#!/bin/sh

localip=`ip addr list dev eth0 | grep "inet " | sed 's/(^s*inets)([0-9.]*)([s/].*)/2/'`

if [[$ip != ""]]; then

sudo ip addr del $localip dev eth0

fi

You need to run it manually or set it into crontab. Or, try to call it after IP assigned, but I don't know how to hook that.

share|improve this answer

answered 17 mins ago

sceggscegg

1011

New contributor

scegg is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

0

if you don't want to add a static ip on this interface, maybe you have to delete the IP assigned by DHCP client.

Running this script will remove the ip on eth0.

#!/bin/sh

localip=`ip addr list dev eth0 | grep "inet " | sed 's/(^s*inets)([0-9.]*)([s/].*)/2/'`

if [[$ip != ""]]; then

sudo ip addr del $localip dev eth0

fi

You need to run it manually or set it into crontab. Or, try to call it after IP assigned, but I don't know how to hook that.

share|improve this answer

answered 17 mins ago

sceggscegg

1011

New contributor

scegg is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

if you don't want to add a static ip on this interface, maybe you have to delete the IP assigned by DHCP client.

Running this script will remove the ip on eth0.

#!/bin/sh

localip=`ip addr list dev eth0 | grep "inet " | sed 's/(^s*inets)([0-9.]*)([s/].*)/2/'`

if [[$ip != ""]]; then

sudo ip addr del $localip dev eth0

fi

You need to run it manually or set it into crontab. Or, try to call it after IP assigned, but I don't know how to hook that.

share|improve this answer

answered 17 mins ago

sceggscegg

1011

New contributor

scegg is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

#!/bin/sh

localip=`ip addr list dev eth0 | grep "inet " | sed 's/(^s*inets)([0-9.]*)([s/].*)/2/'`

if [[$ip != ""]]; then

sudo ip addr del $localip dev eth0

fi

share|improve this answer

answered 17 mins ago

sceggscegg

1011

New contributor

scegg is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

answered 17 mins ago

sceggscegg

1011

New contributor

scegg is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

answered 17 mins ago

sceggscegg

1011