 msjPremium
join:2004-05-21
Fort Collins, CO
kudos:1 | reply to bigjoesmith
Re: DHCP Spoofing / Half Bridging said by bigjoesmith:The problem you identified where the address of the gateway is not within the subnet of any connected networks is just that...it's only a problem when the gateway is outside the network of the public IP given to the local host. I suspect the "bogus" netmask is used to minimize the cases where the address of the gateway in not within the subnet of any of the connected networks. If I had to guess, that's what I would advance as their reason for cremudging up a 255.255.0.0 netmask as opposed to a 255.255.255.255 netmask. I guess that is a possibility. But since there is some code in pppd that chooses a netmask based on the old network class system, it could just be a side effect of that also. It would be interesting to see what would happen if someone with a static IP used such a modem, since Qwest's static addresses are mostly allocated from the 207.224.0.0 network. That address is in the old class C region. So it would be interesting to see if the modem would assign a 255.255.255.0 address instead, or if it still used 255.255.0.0.
But you are right that if the gateway address was within the netmask range then Linux wouldn't have the problem I noticed. Perhaps that explains why some people haven't seen a problem using the modem with Linux. |
