It will work fine for any destination other then 210.210.210.x/24 which is the classful network for your IP subnet.
A better real-world internet example with no ip classless and internet connections would be, if you had a 64.x.x.x subnet on the serial and similar on LAN side. In this case, 64.0.0.0/8 is the classful range. There are many other customers that have a subnet in this classful range out there. With 'no ip classless' and a default route with nexthop of 64.x.x.x any traffic destined to a 64.x.x.x site would fail, but traffic to 210.x.x.x, 65.x.x.x, etc would work. Erick --- YI Zhou wrote: > according to many books, ip classless should be used > to be able to use > default route. > > but I just found my internet router, actually has no > ip classless. > > which means I am using classful route lookup. > > And this is working fine,who can explain why???? > > note that ip address here is not real one. > > ! > hostname xxx > ! > enable secret xxx > ! > ip subnet-zero > no ip domain-lookup > ip name-server x.x.x.x > > ! > interface FastEthernet0/0 > ip address 210.210.210.62 255.255.255.240 > no ip directed-broadcast > ! > interface Serial0/0 > bandwidth 64 > ip unnumbered FastEthernet0/0 > no ip directed-broadcast > no ip mroute-cache > no fair-queue > ! > no ip classless > ip route 0.0.0.0 0.0.0.0 Serial0/0 > > > Gateway of last resort is 0.0.0.0 to network 0.0.0.0 > > 210.210.210.0/28 is subnetted, 1 subnets > C 210.210.210.48 is directly connected, > FastEthernet0/0 > S* 0.0.0.0/0 is directly connected, Serial0/0 > xxx# > > xxx#sh flash > > System flash directory: > File Length Name/status > 1 3612344 c2600-i-mz.120-3.T3 > [3612408 bytes used, 4776200 available, 8388608 > total] > 8192K bytes of processor board System flash > (Read/Write) [EMAIL PROTECTED] __________________________________________________ Do you Yahoo!? Yahoo! News - Today's headlines http://news.yahoo.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=53238&t=53231 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
