[ale] Cablemodem shows in my traceroutes?
Robert L. Harris
Robert.L.Harris at rdlg.net
Thu Feb 27 11:08:45 EST 2003
I can get in and out fine, traceroutes are just slow some days and I'd
never seen it before (or not noticed). It's got a short name of
"cablemodem" as I've put it in /etc/hosts just to speed up lookups.
Thus spake Drag0n (dragon at atlantacon.org):
> It is common for frame providers to route traffic across their internal
> network using assigned private numbers. A cablemodem is in a way, a
> hybid ATM frame relay network. What looks like is happening is some
> admin of the network is either cut and pasted the wrong host name into
> the dns table or they are just using a simple name to refer to the core
> cablemodem router. If everything works as its supposed to, (you can get
> out and data can get in) then there is nothing to worry about. I get a
> similar situation from home, but am able to access my home systems
> remotely so no routing problems there.
>
> 1 * * * (I drop all icmp trafic aimed at my firewall, internal or
> external)
> 2 10.238.252.1 (10.238.252.1) 7.257 ms 9.202 ms 11.586 ms
> 3 c-66-56-66-2.atl.client2.attbi.com (66.56.66.2) 7.950 ms 11.592
> ms 8.365 ms
> 4 c-66-56-23-38.atl.client2.attbi.com (66.56.23.38) 8.265 ms 10.729
> ms 8.158 ms
> 5 c-66-56-22-146.atl.client2.attbi.com (66.56.22.146) 8.186 ms
> 23.566 ms 9.122 ms
>
> Drag0n
> dragon at atlantacon.org
>
> "Robert L. Harris" wrote:
> >
> > I'm trying to debug some IPv6 and just ran a traceroute from behind my
> > firewall:
> >
> > {0}:/usr/src/kernel>traceroute www.kame.net
> > traceroute to apple.kame.net (203.178.141.220), 30 hops max, 38 byte
> > packets
> > 1 wally (192.168.0.1) 0.249 ms 0.154 ms 0.130 ms
> > 2 cablemodem (10.2.0.1) 31.877 ms 9.824 ms 66.160 ms
> > 3 209.186.118.17 (209.186.118.17) 11.221 ms 11.911 ms 9.951 ms
> > 4 172.26.96.2 (172.26.96.2) 13.143 ms 9.803 ms 15.492 ms
> > 5 65.90.64.5 (65.90.64.5) 13.588 ms 12.239 ms 12.465 ms
> > 6 P5-0.c0.atln.broadwing.net (216.140.12.41) 12.650 ms 12.825 ms 12.056 ms
> > 7 p3-0.c0.wash.broadwing.net (216.140.8.109) 22.946 ms 24.353 ms 23.576 ms
> > .
> > .
> > .
> >
> > umm, this is odd as the external interface of my firewall (wally) has a
> > valid IP (24.216.225.11)...
> >
> > From my firewall:
> >
> > raceroute to apple.kame.net (203.178.141.220), 30 hops max, 38 byte
> > packets
> > 1 cablemodem (10.2.0.1) 77.861 ms 20.864 ms 8.453 ms
> > 2 209.186.118.17 (209.186.118.17) 24.057 ms 39.684 ms 9.449 ms
> > 3 172.26.96.2 (172.26.96.2) 12.061 ms 10.679 ms 10.443 ms
> > 4 65.90.64.5 (65.90.64.5) 19.208 ms 11.687 ms 12.402 ms
> > 5 P5-0.c0.atln.broadwing.net (216.140.12.41) 19.451 ms 12.975 ms 16.829 ms
> > 6 p3-0.c0.wash.broadwing.net (216.140.8.109) 27.234 ms 29.734 ms 23.076 ms
> >
> > Anyone else see this? Is it normal? I thought the cable modems acted
> > like a transparent bridge and wouldn't show in traceroutes, etc...
> >
> > Robert
> >
> > :wq!
> > ---------------------------------------------------------------------------
> > Robert L. Harris | PGP Key ID: E344DA3B
> > @ x-hkp://pgp.mit.edu
> > DISCLAIMER:
> > These are MY OPINIONS ALONE. I speak for no-one else.
> >
> > Diagnosis: witzelsucht
> >
> > IPv6 = robert at ipv6.rdlg.net http://ipv6.rdlg.net
> > IPv4 = robert at mail.rdlg.net http://www.rdlg.net
> >
> > ------------------------------------------------------------------------
> > Part 1.2Type: application/pgp-signature
>
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:wq!
---------------------------------------------------------------------------
Robert L. Harris | PGP Key ID: E344DA3B
@ x-hkp://pgp.mit.edu
DISCLAIMER:
These are MY OPINIONS ALONE. I speak for no-one else.
Diagnosis: witzelsucht
IPv6 = robert at ipv6.rdlg.net http://ipv6.rdlg.net
IPv4 = robert at mail.rdlg.net http://www.rdlg.net
PGP signature
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