[CLUE-Tech] PPTP DNS Problems

[Chris Schock]

Maybe I'm not understanding the output correctly, but you have eth1 as
your default gateway, not ppp0.

Do you by chance have another DNS server hanging off eth1 someplace?

My suggestion is to fire up (t)ethereal or tcpdump and listen to both
interfaces when you do a traceroute, and see where the DNS answers are
coming from.

You may be getting DNS replies off of eth1 and not ppp0. Even if you
specify a DNS server, sometimes hosts broadcast a DNS request (and hope a
DNS server listens and responds) instead of going directly to a specific
DNS server.


> On Mon, 2004-10-25 at 18:24, David Anselmi wrote:
>> David L. Willson wrote:
>> [...]
>> > Dave, thanks for guessing, but no, I don't seem to have the entry, and
>> > the problem seems to affect all hosts, in any case.  Frustratin'...
>>
>> Well, another guess.  What does /etc/resolv.conf look like, and what
>> does route say when the PPTP connection is up?
>>
> I can send this as an attachment, to avoid the extraneous line-feeds,
> but then my post won't get through, I think.  Go here
> (http://mailman.thegeek.nu/~dlwillson/output.txt) for uncorrupted
> version.
>
> -----------    console session c&p    ----------------------------
> [david at geneva david]$ /sbin/ifconfig ppp0
> ppp0      Link encap:Point-to-Point Protocol
>           inet addr:10.100.0.102  P-t-P:10.100.0.131
> Mask:255.255.255.255
>           UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
>           RX packets:16502 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:21732 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:3
>           RX bytes:2932092 (2.7 Mb)  TX bytes:2501367 (2.3 Mb)
>
> [david at geneva david]$ /sbin/route
> Kernel IP routing table
> Destination     Gateway         Genmask         Flags Metric Ref    Use
> Iface
> 10.100.0.131    *               255.255.255.255 UH    0      0        0
> ppp0
> host-65-125-246 192.168.73.254  255.255.255.255 UGH   0      0        0
> eth1
> 192.168.73.0    *               255.255.255.0   U     0      0        0
> eth1
> 10.100.0.0      *               255.255.255.0   U     0      0        0
> ppp0
> 169.254.0.0     *               255.255.0.0     U     0      0        0
> eth1
> default         192.168.73.254  0.0.0.0         UG    0      0        0
> eth1
> [david at geneva david]$ cat /etc/resolv.conf
> nameserver 10.100.0.25
>
>
> -
>
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