Ok, I am posting in the top since I made such a boo boo. This is the second or third time I made this transposition. I did not mean DNS servers but DHCP servers. It must be an age thing On Tue, 2008-03-25 at 11:29 -0400, Matthew Saltzman wrote: > On Tue, 2008-03-25 at 10:24 -0600, Aaron Konstam wrote: > > On Mon, 2008-03-24 at 17:58 -0400, Matthew Saltzman wrote: > > > On Mon, 2008-03-24 at 16:09 -0600, Aaron Konstam wrote: > > > > > > > You really can't edit /etc/resolv.conf when you are using a DNS server. > > > > When you are connected to the network it is the DNS nameserver that sets > > > > up the resolv.conf file. In the first case above: > > > > > > This isn't quite correct. > > > > > > /etc/resolv.conf contains the IP addresses of your DNS servers. > > This is a semantic argument. We are talking about wireless. Until you > > connect to the wireless router's AP the resolve.conf computer has no > > idea about the name of your DNS server. The router supplies that form > > the DNS server. > > Not semantics at all. DNS servers don't self-report--and in particular, > they don't reach out and edit clients' /etc/resolv.conf files. DHCP > servers can provide DNS server information to clients, or not. If it is > offered, DHCP clients can accept the information (and place it > in /etc/resolv.conf), or not. For static IP addresses and for DHCP > clients that don't get DNS info from the server, /etc/resolv.conf > contents must be created manually. > > Clients are not required to use the local network's suggestions for DNS > servers--they can use any servers they can reach by IP address. (For > example, clients can run their own caching nameservers, and just use > 127.0.0.1 as the DNS server IP.) > > Some wireless routers will get their own IP addresses by DHCP from, say, > a DSL modem (which may in turn get its IP address and DNS server info > from the ISP). As a DHCP server, the modem may provide DNS server > information to the router. As a DHCP client, the router may accept that > information or the user may set it (and/or the router's IP address) > manually. > > Having the router get DNS from the modem and provide it in turn to > clients is a pretty seamless way to go, and it is quite common > (particularly in home networks), but it is by no means required. > > > > > > > If you connect to your network with a DHCP server, that server provides > > > your IP address and it *may* provide information about DNS servers, > > > which your dhcp client will put in /etc/resolv.conf. It also may not, > > > or you may decline to use the provided information. Or you may connect > > > statically. In that case, you need to hand-edit /etc/resolv.conf or use > > > system-config-network to set static DNS servers. > > > > > > > > # generated by NetworkManager, do not edit! > > > > > ; Use a local caching nameserver controlled by NetworkManager > > > > > nameserver 127.0.0.1 > > > > > > > > you has not yet made a connection to the internet. > > > > > > Network manager uses a DHCP client to get your DNS info and places it > > > in /etc/resolv.conf. If you decline to use that information, you > > > probably have installed a caching nameserver. In that case, its IP > > > address is 127.0.0.1 > > -- > Matthew Saltzman > > Clemson University Math Sciences > mjs AT clemson DOT edu > http://www.math.clemson.edu/~mjs > -- ======================================================================= You work very hard. Don't try to think as well. ======================================================================= Aaron Konstam telephone: (210) 656-0355 e-mail: akonstam@xxxxxxxxxxxxx
