the difference between the two machines is that they're talking to different DHCP servers.
what you "request" from the DHCP server, and what the DHCP server decides to send you, are two different things. if you're unhappy with what the DHCP server sends you, that's what the "default", "supersede", "prepend" and "append" options are for. -ken On Tue, Aug 31, 2010 at 12:24 PM, <ted....@comcast.net> wrote: > Hello: > > Using 4.6 (updating to 4.7 is my next project), I have set up two machines > at > two separate sites to that create a ipsec tunnel between them. > > Both machines get a dynamic ip address for their internet connection from > the > ISP (comcast at one end, AT+T at the other). > > Both machines have the /etc/dhclient.conf file modified to include: > > request subnet-mask, broadcast-address, time-offset, routers; > > The line above is the ONLY line that is not a comment in either > dhclient.conf > file. > > Both machines have /etc/hostname.sk0 (the world facing interface) set up > as: > > dhcp NONE NONE NONE > > (i think i don't need the "NONE"s, but that's the way I originally did it > several months ago) > > I also have a "resolv.conf.tail" file, although given the fact that I have > excluded "domain-name" and "domain-name-servers", I shouldn't need it. > > I have set up resolv.conf on each machine as I want it. > > BUT, one machine (the comcast one) works like I would expect.B It gets a > dynamic ip address and does not change the resolv.conf file.B When i look > at > /var/db/dhclient.leases.sk0, i see that no information exists regarding dns > servers or domain names. > > ON the other machine (the AT+T one) things are different.B It gets a > dynamic > ip address, but also updates the resolv.conf with a domain name and dns > server > from the dhcp server.B it also, as expected, then appends the contents of > resolv.conf.tail to the new resolv.conf file, and also creates a > resolv.conf.save file. Also, the data in /var/db/dhclient.leases.sk0 shows > that the dhcp client received dns server and domain name info from the dchp > server: > .... > B option domain-name-servers 192.168.1.254; > B option domain-name "gateway.2wire.net"; > .... > (despite the dhclient.conf file specifically excluding that information > from > the request line) > > I can (sort of), make it do what i want by using supersede lines in the > dhclient.conf file; but I don't understand what I have done different > between > the two machines.B As I said, both hostname.sk0 and dhclient.conf files > are > identical.B I have tried (on the problem machine) deleting > resolv.conf.save > and /var/db/dhclient.leases.sk0, and then rebooting (starting with a clean > slate, I was thinking), but that does nothing. > > What am I missing? > > Thanks > bye - ted
