192.168.0.1/16???

[burtsbees]

Where to start...here's my topology...
pc---Cat2924XL---2620-----2620XM---AT&T_adsl_MODEM---internet

PC gets IP via dhcp from 2620. The 2620 is connected to the 2620XM via two "bonded" asynch serial interfaces. The 2620XM fa0/0 gets IP from the MODEM via DHCP.
I can ping from the pc through everything to the fa0/0 interface of the 2620XM. The ip address of fa0/0 on the 2620XM is 192.168.1.64/16, and the ip address of the ethernet interface on the modem is 192.168.0.1/16. The modem does NAT. I can ping 192.168.0.1 from fa0/0 of the 2620XM, which is evident also of the fact that it got the ip address from 192.168.0.1. However, I cannot ping 192.168.0.1 from anything else---remember, I can ping 192.168.1.64, which is fa0/0 of the 2620XM, and it is directly connected to 192.168.0.1. I have configured eigrp on the two routers, and on the 2620XM, I put in 192.168.0.0 0.0.255.255 in one of the network statements. The sh ip route from the 2620 shows that 192.168.0.0/16 can be reached via the virtual access (loopback) of the 2620XM. Does the supernet mask for 192.168.0.0 kinda screw things up??? I am at a loss on this one.
One more thing to note...I tried to configure the modem to "share" the public IP address with fa0/0, which gave it a class B public IP---this just made things worse for my poor routers, because the modem still had its 192.168.0.1, which was connected to fa0/0!!! HELP!!!

Burt

 

[plshlpme]

hey burt.. i think it would be easier to put your modem into bridged mode and have the 2620xm do the pppoe and nat...
it would be much easier for you to control at that point...

thats how i have my dsl setup at home.

 

[burtsbees]

What kind of router do you have? Do I just make a PPP config, PAP and CHAP without dialer interfaces since there is no ATM?

Burt

 

[norteldude78]

hmmmm....subnet mask might screw things up....what are the subnets we are dealing with?

subnet 1: PC ---> 2620 (?.?.?.?/?)
subnet 2: 2620 --> 2620XM (?.?.?.?/?)
subnet 3: 2620XM ---> Modem (192.168.0.0/16)

You need to check the route table on both 2620s. 2620 should probably point to 2620XM as the default gateway...and 2620XM should point to the modem as the gateway...
-B

 

[plshlpme]

im using a 1760...


vpdn enable
!
vpdn-group 1
request-dialin
protocol pppoe

interface FastEthernet0/0
LAN INTERFACE
ip address 10.10.10.1 255.255.255.0
ip verify unicast reverse-path
ip nat inside
ip route-cache policy
ip policy route-map sickle
no ip mroute-cache
speed 100
full-duplex

interface Ethernet0/0
description ADSL WAN Interface
no ip address
no ip redirects
no ip proxy-arp
ip route-cache policy
load-interval 30
half-duplex
pppoe enable
pppoe-client dial-pool-number 1
no cdp enable

interface Dialer1
description ADSL PPPOE DIALER
bandwidth 5000
ip address negotiated
ip access-group INBOUND in
no ip redirects
no ip unreachables
no ip proxy-arp
ip mtu 1492
ip nat outside
ip multicast boundary 30
encapsulation ppp
ip route-cache flow
ip tcp adjust-mss 1452
load-interval 30
dialer pool 1
dialer idle-timeout 0
dialer-group 1
no cdp enable
ppp authentication pap callin
ppp pap sent-username USER password PASS
ppp ipcp dns request
ppp ipcp wins request



and then youll need your nat..
if you want more of the config let me know but i think that will get you going...

 

[burtsbees]

Thanks plshlpme
Nortel---all of that is set up. It's just that I have not yet seen a class c address using a class b mask unless it's a supernet that has been auto-summarrized by eigrp or someting.

Burt

 

[vipergg]

On the routers make sure ip classless is turned on . Also if eigrp is being used add the no auto-summary statement .

 

[burtsbees]

I did both already. That's the first thing I did. I think when I get home, I'll take plshlpme's advice and just bridge the modem for the atm interface.

Burt