From owner-freebsd-questions  Thu Jun  6 13:53:51 2002
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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
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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
> >
> >  
> >
> 
> 
> 
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