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Community Member

unable to ping other subnets from router

I have a new router which I just configured and installed on SITE B which is connected to an X.21 DTU. The link to site A is up and I'm able to ping to Site A and all the way to Headoffice. I have a EIGRP 5 configured on both site A and site B routers. when I execute a command show ip route 1.1.1.0 on router at site B it's telling the subnet is not in the subnet table. When I do a ip eigrp 5 topology, I can only see site A and not the headoffice routes. I've now since added static routing on site B router. But it's still not helping. What am I missing, pls help

1 ACCEPTED SOLUTION

Accepted Solutions
Hall of Fame Super Bronze

Re: unable to ping other subnets from router

You aren't able to reach 10.254.4.0/24 from the SiteB router ?

SiteB router has it in the routing table therefore is not a routing problem.

I guess you have to trust the head office's network person on having 160.8.86.0/24 in their routing table.

Do they also have a route for 160.8.200.140/30 ? This is the serial IP subnet between SiteA and SiteB. This must also be in the head office routing table so you can telnet from SiteB's router. However, you should be able to telnet from SiteB's router if you source your telnet from SiteB's LAN interface

telnet [head office] /source FastEthernet0/0

SiteB LAN should be able to ping all the way to head office. Have you tried pinging from the servers ?

If this doesn't work, then you need to verify if the head office has any ACLs.

23 REPLIES
Hall of Fame Super Bronze

Re: unable to ping other subnets from router

Did you check if the routers became EIGRP neighbors (show ip eigrp neighbors) ?

It will also help if you can post the config from SITEA and SITEB.

Community Member

Re: unable to ping other subnets from router

yes I did and they pickup the serial interfaces in which the sites are connected via. I've attached here the configs for both sites.

Community Member

Re: unable to ping other subnets from router

Just a clarification:

From routerB, you are able to ping routerA and packets get through to the HQ, but you're NOT able to see the routes in IEGRP topology table. Is this correct?

When you do a "sh ip route" in routerB, what do you see comparing to RouterA? The same goes for "show ip iegrp topo"? Post hte config please.

can you post a traceroute from RouterB to RouterA and vice versa.

Community Member

Re: unable to ping other subnets from router

Yes I'm able to ping to router A from router B but I can't ping from inside the telnet session session to Headoffice, accept when I'm on the command prompt of my pC.

When I do a 'sho ip route' for the headoffice subnet, it's telling me the subnet is not in the subnet table. even though EIGRP is configured on.

For this reason the servers sitting on the LAN on site B are not able to replicate with our servers in HeadOffice. Pls help

Community Member

Re: unable to ping other subnets from router

I'm able to ping between the two routers and am able to see the routes in the eigrp topology. I'm able to see all the routes in Site B on the Site A router when I do a show IP route.

siteB_1841# show ip route

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2

i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

ia - IS-IS inter area, * - candidate default, U - per-user static route

o - ODR, P - periodic downloaded static route

Gateway of last resort is 160.8.85.44 to network 0.0.0.0

160.8.0.0/16 is variably subnetted, 15 subnets, 4 masks

D 160.8.253.85/32 [90/20640000] via 160.8.200.141, 18:56:04, Serial0/0/0

C 160.8.253.86/32 is directly connected, Loopback0

S 160.8.32.0/22 [1/0] via 160.8.200.141

S 160.8.60.0/22 [1/0] via 160.8.200.141

S 160.8.9.0/24 [1/0] via 160.8.200.141

S 160.8.10.0/24 [1/0] via 160.8.200.141

S 160.8.24.0/24 [1/0] via 160.8.200.141

D EX 160.8.25.0/24 [170/21024000] via 160.8.200.141, 18:56:04, Serial0/0/0

S 160.8.27.0/24 [1/0] via 160.8.200.141

S 160.8.28.0/24 [1/0] via 160.8.200.141

S 160.8.30.0/24 [1/0] via 160.8.200.141

D EX 160.8.16.0/24 [170/21024000] via 160.8.200.141, 18:56:04, Serial0/0/0

C 160.8.200.140/30 is directly connected, Serial0/0/0

D 160.8.85.0/24 [90/20514560] via 160.8.200.141, 18:56:06, Serial0/0/0

C 160.8.86.0/24 is directly connected, FastEthernet0/0

10.0.0.0/24 is subnetted, 1 subnets

D EX 10.254.4.0 [170/21024000] via 160.8.200.141, 18:56:06, Serial0/0/0

S* 0.0.0.0/0 [1/0] via 160.8.85.44

siteA_1841#sh ip route

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2

i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

ia - IS-IS inter area, * - candidate default, U - per-user static route

o - ODR, P - periodic downloaded static route

Gateway of last resort is 160.8.85.44 to network 0.0.0.0

160.8.0.0/16 is variably subnetted, 14 subnets, 4 masks

C 160.8.253.85/32 is directly connected, Loopback0

D 160.8.253.86/32 [90/20640000] via 160.8.200.142, 18:58:48, Serial0/0/1

S 160.8.32.0/22 [1/0] via 10.254.4.2

S 160.8.60.0/22 [1/0] via 10.254.4.2

S 160.8.10.0/24 [1/0] via 10.254.4.2

S 160.8.24.0/24 [1/0] via 10.254.4.2

S 160.8.25.0/24 [1/0] via 10.254.4.2

S 160.8.27.0/24 [1/0] via 10.254.4.2

S 160.8.28.0/24 [1/0] via 10.254.4.2

S 160.8.30.0/24 [1/0] via 10.254.4.2

S 160.8.16.0/24 [1/0] via 10.254.4.2

C 160.8.200.140/30 is directly connected, Serial0/0/1

C 160.8.85.0/24 is directly connected, FastEthernet0/0

D 160.8.86.0/24 [90/20514560] via 160.8.200.142, 18:58:50, Serial0/0/1

10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C 10.254.4.0/30 is directly connected, Serial0/0/0

S 10.254.4.0/24 [1/0] via 10.254.4.2

S* 0.0.0.0/0 [1/0] via 160.8.85.44

siteA_1841#

siteB_1841#trace 160.8.85.20

Type escape sequence to abort.

Tracing the route to 160.8.85.20

1 160.8.200.141 16 msec * 16 msec

SiteB_1841#

siteA_1841#trace 160.8.86.20

Type escape sequence to abort.

Tracing the route to 160.8.86.20

1 160.8.200.142 28 msec 20 msec *

siteA_1841#

The configs are attached.

Hall of Fame Super Bronze

Re: unable to ping other subnets from router

The configuration looks ok.

Can we see the show ip route from both routers ?

Community Member

Re: unable to ping other subnets from router

siteb_1841# show ip route

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2

i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

ia - IS-IS inter area, * - candidate default, U - per-user static route

o - ODR, P - periodic downloaded static route

Gateway of last resort is 160.8.85.44 to network 0.0.0.0

160.8.0.0/16 is variably subnetted, 15 subnets, 4 masks

D 160.8.253.85/32 [90/20640000] via 160.8.200.141, 18:56:04, Serial0/0/0

C 160.8.253.86/32 is directly connected, Loopback0

S 160.8.32.0/22 [1/0] via 160.8.200.141

S 160.8.60.0/22 [1/0] via 160.8.200.141

S 160.8.9.0/24 [1/0] via 160.8.200.141

S 160.8.10.0/24 [1/0] via 160.8.200.141

S 160.8.24.0/24 [1/0] via 160.8.200.141

D EX 160.8.25.0/24 [170/21024000] via 160.8.200.141, 18:56:04, Serial0/0/0

S 160.8.27.0/24 [1/0] via 160.8.200.141

S 160.8.28.0/24 [1/0] via 160.8.200.141

S 160.8.30.0/24 [1/0] via 160.8.200.141

D EX 160.8.16.0/24 [170/21024000] via 160.8.200.141, 18:56:04, Serial0/0/0

C 160.8.200.140/30 is directly connected, Serial0/0/0

D 160.8.85.0/24 [90/20514560] via 160.8.200.141, 18:56:06, Serial0/0/0

C 160.8.86.0/24 is directly connected, FastEthernet0/0

10.0.0.0/24 is subnetted, 1 subnets

D EX 10.254.4.0 [170/21024000] via 160.8.200.141, 18:56:06, Serial0/0/0

S* 0.0.0.0/0 [1/0] via 160.8.85.44

siteb_1841#

siteA_1841#sh ip route

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2

i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

ia - IS-IS inter area, * - candidate default, U - per-user static route

o - ODR, P - periodic downloaded static route

Gateway of last resort is 160.8.85.44 to network 0.0.0.0

160.8.0.0/16 is variably subnetted, 14 subnets, 4 masks

C 160.8.253.85/32 is directly connected, Loopback0

D 160.8.253.86/32 [90/20640000] via 160.8.200.142, 18:58:48, Serial0/0/1

S 160.8.32.0/22 [1/0] via 10.254.4.2

S 160.8.60.0/22 [1/0] via 10.254.4.2

S 160.8.10.0/24 [1/0] via 10.254.4.2

S 160.8.24.0/24 [1/0] via 10.254.4.2

S 160.8.25.0/24 [1/0] via 10.254.4.2

S 160.8.27.0/24 [1/0] via 10.254.4.2

S 160.8.28.0/24 [1/0] via 10.254.4.2

S 160.8.30.0/24 [1/0] via 10.254.4.2

S 160.8.16.0/24 [1/0] via 10.254.4.2

C 160.8.200.140/30 is directly connected, Serial0/0/1

C 160.8.85.0/24 is directly connected, FastEthernet0/0

D 160.8.86.0/24 [90/20514560] via 160.8.200.142, 18:58:50, Serial0/0/1

10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C 10.254.4.0/30 is directly connected, Serial0/0/0

S 10.254.4.0/24 [1/0] via 10.254.4.2

S* 0.0.0.0/0 [1/0] via 160.8.85.44

siteA_1841#

Hall of Fame Super Bronze

Re: unable to ping other subnets from router

I'm trying to follow the logic here since your original post you mentioned network 1.1.1.0/24.

I assume your network office's subnet is 10.254.4.0/24 ?

SiteB has that route

D EX 10.254.4.0 [170/21024000] via 160.8.200.141, 18:56:06, Serial0/0/0

But does the network office has a route to SiteB on its routing table ? 160.8.86.0/24

It seems you aren't running EIGRP between SiteA and the HeadOffice, relying simply on static routes. On the headoffice router 10.254.4.2/30, you need a route to 160.8.86.0/24 with gateway 10.254.4.1

Community Member

Re: unable to ping other subnets from router

There is already a route on the Provider's router for 160.8.86.0/24.

Yes the subnet at the Provider's office is 10.254.4.0/24.

EIGRP is only configured on the routers at both site A and site B routers as we control that. The provider's office doesn't have eigrp as they run a different routing protocol and they control their own configs. They also have other clients connected to their router.

When he traces from his router he's able to come all the way to Site B. When I trace from site A to our headoffice, I'm able to go all the way to our head office. And from within the router in site A I can ping our head office LAN. I can't do the same from the site B router while in a telnet session. For this reason our servers sitting on the site B LAN are not able authenticate with the servers at our head office.

The link between site A & B is a 128Kbps Telecom Leased Line. It's a point-to-point connection going through the Telecom exchange. Is there a protocol that we need to enable on both ends to fix this problem?

Hall of Fame Super Bronze

Re: unable to ping other subnets from router

You aren't able to reach 10.254.4.0/24 from the SiteB router ?

SiteB router has it in the routing table therefore is not a routing problem.

I guess you have to trust the head office's network person on having 160.8.86.0/24 in their routing table.

Do they also have a route for 160.8.200.140/30 ? This is the serial IP subnet between SiteA and SiteB. This must also be in the head office routing table so you can telnet from SiteB's router. However, you should be able to telnet from SiteB's router if you source your telnet from SiteB's LAN interface

telnet [head office] /source FastEthernet0/0

SiteB LAN should be able to ping all the way to head office. Have you tried pinging from the servers ?

If this doesn't work, then you need to verify if the head office has any ACLs.

Community Member

Re: unable to ping other subnets from router

Hi

thanks, by adding a route for network 160.8.200.140/24 to our network provider's router and our router back at our headoffice I'm able to ping outher subnets fromn the site B router.

The next problem is, I'm unable to access applications like email, remote desktop, as400 and other tcp applications from the LAN on site B. Why is that? Pls help.

Hall of Fame Super Bronze

Re: unable to ping other subnets from router

> The next problem is, I'm unable to access applications like email, remote desktop, as400 and other tcp applications

> from the LAN on site B. Why is that? Pls help.

Are you able to ping those devices ?

Where are the the applications located (what subnet? )

Can you post the show ip route from the router on Site B and the router where those applications are hosted ?

Community Member

Re: unable to ping other subnets from router

I'm able to ping devices hosting these applications at our head office.

The subnets which the applications are hosted are; 160.8.32.0/22, 160.8.10.0/24, 160.8.28.0/24, 160.8.27.0/24, 160.8.60.0/24, 160.8.24.0/24, etc.

I've attached the show ip routes for the site B router and the headoffice main gaeway router.

Hall of Fame Super Bronze

Re: unable to ping other subnets from router

SiteB has static routes to those networks

S 160.8.32.0/22 [1/0] via 160.8.200.141

S 160.8.10.0/24 [1/0] via 160.8.200.141

S 160.8.27.0/24 [1/0] via 160.8.200.141

S 160.8.60.0/22 [1/0] via 160.8.200.141

S 160.8.24.0/24 [1/0] via 160.8.200.141

pointing to the serial interface on SiteA, which is fine.

The head office has a route to SiteB LAN

S 160.8.86.0/24 [1/0] via 160.8.32.21

_______________

The device 160.8.32.21 has a route for 160.8.86.0/24 ? That's not SiteA's router.

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