02-07-2009 10:26 PM - edited 03-04-2019 03:28 AM
Hello friends ,
I connect two LANs together with two Cisco 2600 with PARADYNE 7975 M/SDSL.
I can telnet each of them trough another router.
But computers that each side can't ping another side.
LAN1 IP address is : 172.20.0.0 255.255.0.0
LAN2 IP address is : 172.17.0.0 255.255.0.0
---------- Router1 -------------------
interface FastEthernet0/0
ip address 172.20.2.3 255.255.0.0
duplex auto
speed auto
interface Serial0/1
ip address 172.18.2.5 255.255.255.0
encapsulation ppp
ip classless
ip route 0.0.0.0 0.0.0.0 FastEthernet0/0
ip route 172.17.0.0 255.255.0.0 Serial0/1
ip route 172.18.0.0 255.255.255.0 Serial0/1
ip route 172.20.0.0 255.255.0.0 FastEthernet0/0
no ip pim bidir-enable
---------- Router2 -------------------
interface FastEthernet0/0
ip address 172.17.2.1 255.255.0.0
duplex auto
speed auto
interface Serial0/1
ip address 172.18.2.6 255.255.255.0
encapsulation ppp
ip classless
ip route 0.0.0.0 0.0.0.0 Serial0/1
ip route 172.17.0.0 255.255.0.0 FastEthernet0/0
ip route 172.18.0.0 255.255.255.0 Serial0/1
ip route 172.20.0.0 255.255.0.0 Serial0/1
Thanks for your helping.
02-08-2009 12:34 AM
Does not look like there is anythin wrong with the basic config. Do the computers on each LAN have a default gateway pointing to the router IP address at each site?
HTH>
02-08-2009 01:47 AM
remove these routes they are not necessary:
from router1
ip route 172.18.0.0 255.255.255.0 Serial0/1
ip route 172.20.0.0 255.255.0.0 FastEthernet0/0
from router2
ip route 172.17.0.0 255.255.0.0 FastEthernet0/0
ip route 172.18.0.0 255.255.255.0 Serial0/1
ip route 172.20.0.0 255.255.0.0 Serial0/1
make sure you don't have "no ip routing" in the config file.
can you display the output of : show ip interfaces brief
02-08-2009 03:19 AM
Hello ohass,
Thank for your help ,
"ip route 172.20.0.0 255.255.0.0 Serial0/1 ", from router2 is necessary. right ?
here is output of :show ip interfaces brief
Router1
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 172.20.2.3 YES NVRAM up up
Serial0/0 unassigned YES NVRAM administratively down down
Serial0/1 172.18.2.5 YES manual up up
Router2
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 172.17.2.1 YES manual up up
Serial0/0 unassigned YES NVRAM administratively down down
FastEthernet0/1 unassigned YES NVRAM administratively down down
Serial0/1 172.18.2.6 YES manual up up
Thanks for helping
02-08-2009 01:04 PM
You really should avoid using interfaces as the destinations of routes, unless you are also including an IP address.
This causes the router to ARP for the next address every time it sends a packet out that interface.
Try replacing the routing statements with IP addresses instead of interfaces, and see if it helps your problem.
hth,
nick
02-09-2009 08:59 PM
yes it is necessary but since you have a default route (0.0.0.0) this will replace the static route. any way: any one will be enough.
now:
1-from rtr1 (console) try to ping wan of rtr2.
2-plz disp;ay the output of show ip route
02-10-2009 12:28 AM
Hi, did you configure gateway address on your end machines ?
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