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Jeroen Landheer
Asked: 2014-03-21 15:18:16 +0800 CST

Edge firewall on Ubuntu, dynamic IP address, static DNS

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We're setting up a software firewall, and one of the issues we're facing is that eth0 has a dynamic IP address.

In /etc/network/interfaces we've got the following:

# The loopback network interface
auto lo
iface lo inet loopback

# internet-facing interface
auto eth0
iface eth0 inet dhcp
    dns-nameservers 192.168.5.8 192.168.5.5
    dns-search -------.local

# The primary network interface
auto eth1
iface eth1 inet static
    address 192.168.5.252
    netmask 255.255.255.0
    network 192.168.5.0
    broadcast 192.168.5.255
    dns-nameservers 192.168.5.8 192.168.5.5
    dns-search -------.local

# This is an autoconfigured IPv6 interface
iface eth1 inet6 auto

The problem is that resolv.conf ends up with the DNS IP's of our ISP...

Update As stated above, resolv.conf gets the DNS IP addresses of our ISP that are part of the DHCP Package. The idea is that we get just an IP address, but basically only use our internal DNS servers. So the DNS parameters of DHCP should be ignored. Any ideas how to accomplish this?

ubuntu

0 Answers