[lug] DNS problems

[D. Stimits]

I myself ran into this sort of issue during my RH 7.1 install, and I had
others later ask me about it after seeing it on a google search. Of
those who asked, the answer I had was also theirs: Default route was not
set up properly. With ppp down, you should not have a default route,
since you can access only your internal machines and there will be a
route for the netmask of each internal address by those means. When ppp
is up, it should show a default route. I don't remember the exact edit,
but there was a /etc/some_subdirectory/ edit that fixed this. To test,
run the "route" command and look for "default" in the Destination
column; do this both with and without ppp up, expect to see it with ppp
up, and expect it to not exist with ppp down. Elyse gave you the means
to add it, but you migth also use this to remove a default route that
shouldn't be there as a test (route command to add or remove will not be
permanent unless you edit the right scripts). Use route del on your
default if you have a default with ppp down; bring up ppp, and if a
default does not exist, add one to your ppp link remote address (the ppp
remote will be the gateway, and destination is default or 0.0.0.0).

D. Stimits, stimits at idcomm.com

Elyse Grasso wrote:
> 
> Does her machine have a lan connection as well as the ppp? I find that when
> that is the case, the gateway doesn't get set correctly when the ppp
> connection is constructed. Try doing a route -n and make sure the default
> gateway is set to ppp0, or just add a route to the universe via ppp0.
> 
> (I use 'route add -net 0.0.0.0 netmask 0.0.0.0 dev ppp0' which is bogus but
> seems to let things talk to the offsite nameservers...)
> 
> Hope this helps.
> 
> On Tuesday 02 April 2002 12:48 pm, you wrote:
> > Last week my wife started working to upgrade her aging copy of KRUD, and
> > ran into a problem with DNS.  She is using KPPP to create a dialup
> > connection.  This seems to work in the sense that the modem dials, she
> > gets a connection with the ISP, authentication seems to work OK, and PPP
> > evidently gets started.  After that though, she isn't able to connect to
> > anything.
> >
> > I took a look at things, and it seems that for whatever reason her system
> > is not able to find the DNS servers.  At first I was a bit surprised that
> > the resolv.conf file was empty, but once KPPP dials the modem and connects
> > it copies the correct nameserver entries into the file.  I was able to
> > connect to some known machines using raw IP addresses, and creating an
> > entry for one of these in her host table solves the problem for that one
> > machine.
> >
> > So ... any suggestions about what I should have her check next?
> >
> > - Wayde
> >   (wallen at lug.boulder.co.us)
> >
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> >
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