Ethereal-users: Re: [Ethereal-users] Wierdness in CablemodemLand?

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From: "John E. Mayorga" <jmayorga5@xxxxxxxxx>
Date: Mon, 22 Apr 2002 01:07:16 -0700 (PDT)
--- Guy Harris <gharris@xxxxxxxxx> wrote:
> On Sun, Apr 21, 2002 at 10:12:07PM -0700, John E.
> Mayorga wrote:
> > traceroute to 24.127.52.9 (24.127.52.9), 3 hops
> max,
> > 38 byte packets
> >  1  c-24-127-52-1.we.client2.attbi.com
> (24.127.52.1) 
> > 9.447 ms  11.929 ms  10.144 ms
> >  2  c-24-127-52-9.we.client2.attbi.com
> (24.127.52.9) 
> > 17.247 ms  19.768 ms  21.184 ms
> > 
> > traceroute to 24.127.52.10 (24.127.52.10), 3 hops
> max,
> > 38 byte packets
> >  1  c-24-127-52-10.we.client2.attbi.com
> (24.127.52.10)
> >  0.082 ms  0.065 ms  0.019 ms
> 
> Well, that's some machine that's on the same subnet,
> as far as IP is
> concerned.
> 
> Is it your machine?


Yes.


> What does the routing table look like on your
> machine?

[root@ldap root]# arp
Address                  HWtype  HWaddress          
Flags Mask            Iface
c-24-127-52-1.we.client  ether   00:B0:8E:F7:3C:54   C
                    eth0
[root@ldap root]#

This is the same thing reported by Hunt. Well, pretty
much the same thing. I had to reboot (harware swap).

 
> > traceroute to 24.127.52.14 (24.127.52.14), 3 hops
> max,
> > 38 byte packets
> >  1  c-24-127-52-1.we.client2.attbi.com
> (24.127.52.1) 
> > 8.609 ms  7.837 ms  7.974 ms
> >  2  c-24-127-52-14.we.client2.attbi.com
> (24.127.52.14)
> >  25.201 ms  17.533 ms  19.855 ms
> > 
> > traceroute to 24.127.52.15 (24.127.52.15), 3 hops
> max,
> > 38 byte packets
> >  1  c-24-127-52-10.we.client2.attbi.com
> (24.127.52.10)
> >  2990.854 ms !H  2999.486 ms !H  2999.919 ms !H
> 
> > Subquestion - Why is it that when the script gets
> to
> > 24.127.52.15,19,26,28, etc. the connection does
> not go
> > through the router?
> 
> Well, it's apparently trying to go through *some*
> machine.
> 
> Unfortunately, that machine can't get to
> 24.127.52.15 - 24.127.52.10 is
> returning a Host Unreachable.
> 
> > I used pretty much the same script for ARPing
> 1.04.
> > Here is the output (which makes sense):
> > 
> > ARPING 24.127.52.1 from 24.127.52.10 eth0
> > Unicast reply from 24.127.52.1 [00:B0:8E:F7:3C:54]
> 
> > 8.803ms
> > Sent 1 probes (1 broadcast(s))
> > Received 1 response(s)
> 
> OK, so I infer from "from 24.127.52.10" that
> 24.127.52.10 is your
> machine.

Yes.


> The question is whether it has something in its
> routing table to tell it
> that it's its own router to some machines (machines
> it can't, in fact,
> get to).

John


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