Date: Thu, 6 Jun 2002 16:53:38 -0400 (EDT) From: Stephen Hovey <shovey@buffnet.net> To: Brian Jackson <bjackson@conversent.com> Cc: barbish@a1poweruser.com, FBSDQ <questions@FreeBSD.ORG> Subject: Re: adelphia cable dhcp Message-ID: <Pine.BSF.4.05.10206061651430.20529-100000@buffnet11.buffnet.net> In-Reply-To: <3CFFC860.1050509@conversent.com>
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192.168 is used by dsl and cable routers for the internal addresses when doin nat, as 10.x.x.x often is. The problem with a dhcp network where everybody is sittin on the same line, as in a cable modem situation, is that if someone on your segment puts up a bogus dhcp server that responds more quickly that the proper one - everybody who connects up gets fed bogus IP/DNS/etc data and basically cant route to anywhere. On Thu, 6 Jun 2002, Brian Jackson wrote: > Hi Joe - > > When I used to have Adelphia (I've since given up on them and gone to > Verizon DSL) my traceroutes would lead out to a 10.x.x.x address. In > other words, my address was on the 10.x space, as was my default router. > From there it was blackholed as it traversed their network, and would I > would get globally routed addresses at their ingress/egress point. > > I never saw any 192.168.x.x addresses. > > HTH > > Brian > > Joe & Fhe Barbish wrote: > > >Since recently getting internet access through Adelphia cable > >service my ipfw firewall has been logging these two recurring packets. > > > >Deny P:2 192.168.100.1 224.0.0.1 in via rl0 > >Deny UDP 10.21.68.1:67 255.255.255.255:68 in via rl0 > > > >Both 192.168.100.1 & 10.21.68.1 are reserved private ip ranges and > >should not be coming in over the internet interface. > > > >I am guessing they are part of Adelphia's dhcp process, but want > >confirmation before allowing then in through my firewall. > > > >Are there any FBSD IPFW Adelphia cable users out there who have seen > >this and know what they are? > > > >Thanks > >Joe > > > > > > > > > > > >To Unsubscribe: send mail to majordomo@FreeBSD.org > >with "unsubscribe freebsd-questions" in the body of the message > > > > > > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-questions" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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