How to stop DHCP overwriting /etc/resolv.conf?
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From: Jim on 9 Jul 2010 07:59 One of my network interfaces (dc0) takes its IP from an ADSL router via DHCP. For reasons I'd rather not go into it has to do this - it can't simply be a fixed IP. The problem is that the router is passing on incorrect values for DHCP and seems to be overwriting /etc/resolv.conf Is there a way of getting the DHCP client to not do this? Something in /etc/dhclient.conf perhaps? Jim -- Twitter:@GreyAreaUK "If you have enough book space, I don't want to talk to you." Terry Pratchett
From: Johan van Selst on 9 Jul 2010 08:02 Once upon a newsgroup, Jim claimed: > One of my network interfaces (dc0) takes its IP from an ADSL router via > DHCP. For reasons I'd rather not go into it has to do this - it can't > simply be a fixed IP. > > The problem is that the router is passing on incorrect values for DHCP > and seems to be overwriting /etc/resolv.conf Fix the router settings? Then it will work for all clients. > Is there a way of getting the DHCP client to not do this? Something in > /etc/dhclient.conf perhaps? Yes, you can specify 'prepend domain-name-servers 1.2.3.4;' or even use supersede instead of prepend - see the manual for details. Another option is to make /etc/resolv.conf not-writable (chmod u-r) or even system immutable (chflags schg). Ciao, Johan -- Why do we always come here - I guess we'll never know. It's like a kind of torture to have to watch the show.
From: Jim on 9 Jul 2010 08:09
On 2010-07-09, Johan van Selst <{c.u.b.f.m.}@news.gletsjer.org> wrote: > Once upon a newsgroup, Jim claimed: >> One of my network interfaces (dc0) takes its IP from an ADSL router via >> DHCP. For reasons I'd rather not go into it has to do this - it can't >> simply be a fixed IP. >> >> The problem is that the router is passing on incorrect values for DHCP >> and seems to be overwriting /etc/resolv.conf > > Fix the router settings? Then it will work for all clients. I wish I could but it's got a list of DHCP servers from -somewhere- and it won't let be alter them. Perishing thing. >> Is there a way of getting the DHCP client to not do this? Something in >> /etc/dhclient.conf perhaps? > > Yes, you can specify 'prepend domain-name-servers 1.2.3.4;' or even > use supersede instead of prepend - see the manual for details. That worked a treat - many thanks. > Another option is to make /etc/resolv.conf not-writable (chmod u-r) > or even system immutable (chflags schg). I'll hold that back as the 'nuke from orbit' option :-) Jim -- Twitter:@GreyAreaUK "If you have enough book space, I don't want to talk to you." Terry Pratchett |