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VinzC
Watchman
Joined: 17 Apr 2004
Posts: 5098
Location: Dark side of the mood
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 Posted: Mon Mar 14, 2005 1:46 pm Post subject: How to use Ethernet + wifi in DHCP client mode |
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Hi.
Might sound a dummy question but I have here a laptop with Wireless and an Ethernet card. Coldplug sucessfully starts the wireless and I get an IP automatically if there is a DHCP server behind. I'd like to use DHCP for both the wireless and wired interfaces. Till now everytime I had 2 NICs one of them had a fixed IP, usual for a server. Things are different with a laptop.
Out-of-the box my resolv.conf file gets overwritten when the last interface gets its IP from the DHCP server if both interfaces are active at the same time. Is there a way to have two distinct resolv.conf files, each would be used by its own interface?
There are cases when I must use the domain name that is received by the wireless adapter (at home). There are other cases when I must use the one received by the wired Ethernet. Both links might be active at the same time.
Thanks for any hint/link/suggestion.
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Prompty
Apprentice
Joined: 08 Feb 2004
Posts: 292
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| Posted: Mon Mar 14, 2005 2:36 pm Post subject: |
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AFAIR option -R for dhcpcd
forbids dhcpcd from overwriting resolve.conf
look into your dhcp client man page for details. my case
EDIT:
in your /etc/conf.d/net.IF_NAME you can find
| Code: |
# To stop DHCP from overwritting DNS (/etc/resolv.conf) use the below settings
# peer_dns="no"
# peer_dns_eth0="no"
# To stop DHCP from overwritting NIS (/etc/yp.conf) use the below settings
# peer_nis="no"
# peer_nis_eth0="no"
# To stop DHCP from overwritting NTP /etc/ntp.conf use the below settings
# peer_ntp="no"
# peer_ntp_eth0="no"
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it's as easy as that :]
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VinzC
Watchman
Joined: 17 Apr 2004
Posts: 5098
Location: Dark side of the mood
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| Posted: Mon Mar 14, 2005 9:00 pm Post subject: |
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Thanks, Prompty. However I cannot just prevent one single eth to overwrite resolv.conf. Doing this would suppose one interface is always my main interface (i.e. the one that connects to, say, a private LAN with DNS, firewall, aso).
In some cases my main network is the wireless interface (e.g. at home). In some other cases, e.g. at work, I connect to the LAN using the Ethernet card and to a secondary network using the Wireless interface. Sometimes simultaneously.
If I prevent resolv.conf from being overwritten, say, each time I'm using the wireless, then I wouldn't be able to use my private LAN at home. The other way round is also true. Hence it's not that simple, I think.
I looked into dhcpcd man pages but didn't find any option that would allow me to append, for instance, instead of overwriting the file each time. But I guess this is a bit too complex an operation for DHCPCD.
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