Too many 1's and 0's... Going cross eyed. So basically, the last octet of the netmask is what determines the /# after the ip address. Oh man, more reading to do now again. And I just got it figured out how my other Linux boxes can get out to the internet, and need to look into why the W98se can't..... Will the madness ever end??? ;) Shawn "Austad, Jay" wrote: > I dunno, I haven't used ipchains with a dialup connection. If it works, > good. :) > > CIDR stands for Classless Inter-domain routing (or something like that). > 192.168.2.0 with a netmask of 255.255.255.0 is the same as 192.168.2.0/24. > If you take the netmask and write it in binary, you get: > 11111111 11111111 11111111 00000000 > > which is 24 bits, hence the /24. 255.255.0.0 is "11111111 11111111 00000000 > 00000000" which is /16. And my DSL is 255.255.255.240 which is "11111111 > 11111111 11111111 11110000" which is /28. > > Jay