Re: routing question
email@example.com (Pete Templin) wrote on 18.06.97 in <Pine.LNX.3.96.970616173327.3206Afirstname.lastname@example.org>:
> Let me try some somewhat off-topic questions here: I really think the ISP
> is clueless and not communicating the presence of our network to its
> upstream provider. Could a bunch of you developers please try the
> following three traceroute commands and tell me what you get?
I sent that directly, no need to bother debian-devell with long
traceroutes. In short:
> % traceroute 188.8.131.52
> % traceroute 184.108.40.206
> % traceroute 220.127.116.11
ICMP Host not reachable from fngw-T3-prolog.NEREP.NET.
And all three have working PTR records, i.e. DNS _does_ work.
Telnet to the modem IP works fine:
[ kai@muenster ] ~ $ telnet 18.104.22.168
Connected to 22.214.171.124.
Escape character is '^]'.
Debian GNU/Linux 1.3 srv1.jdweb.com
> I seem to get caught in a routing loop at fngw-T3-prolog.NEREP.NET when I
> try the second and third command, and it looks to me like that router is
> misconfigured. The ISP claims that traceroute (and ping) won't work until
> DNS is ready.
That claim is complete nonsense, of course; and the router is most
> I also can't seem to get out of the intranet via the Linux diald machine.
Under the circumstances, that's what I'd expect.
> I'm testing stuff using tracert under WinNT, and getting *'s. Here's the
> output of route (I've tried cleaning it up manually, but it still doesn't
Try the following. Do a tcpdump on your modem interface (tcpdump -i ppp0).
See if packets from the srv2 actually pass over that interface.
If yes, you just suffer from the ISP's routing problems.
If no, you also have a local problem. Next, do the tcpdump on eth0 to see
if the packets make it to srv1. If yes, the problem is routing on srv1; if
not, it's routing on srv2 (probably a missing route for default to srv1).
> I have created some accounts for generic testing. If any of are brave
> enough to take a snoop on the actual machine, let me know and I'll "let
> you in."
Can do, if you want me to. In that case, drop me a line.
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