ROAS not working

Dilbert65

In my home lab I cannot get ROAS to work. WOuld somebody look at the following and tel me what I am doing wrong. After 4 hours I am beating my head against the wall. I can ping the gateway ffrom each host but nothing else downstream.


Host 1:
interface Ethernet0
ip address 172.12.1.11 255.255.255.0
ip default-gateway 172.12.1.1

Host 2:
interface Ethernet0
ip address 172.12.2.12 255.255.255.0
ip default-gateway 172.12.2.1

Host 3:
interface Ethernet0
ip address 172.12.3.13 255.255.255.0
ip default-gateway 172.12.3.1


Switch Vlan Brief:
11 VLAN0011 active Fa0/1 Host 1
12 VLAN0012 active Fa0/2 Host 2
13 VLAN0013 active Fa0/3 Host 3

Switch trunk connected to router
Port Mode Encapsulation Status Native vlan
Fa0/4 on 802.1q trunking 1


Router:
interface FastEthernet0/0.11
encapsulation dot1Q 11
ip address 172.12.1.1 255.255.255.0
!
interface FastEthernet0/0.12
encapsulation dot1Q 12
ip address 172.12.2.1 255.255.255.0
!
interface FastEthernet0/0.13
encapsulation dot1Q 13
ip address 172.12.3.1 255.255.255.0



IOS's

Host 1:
2500 Software (C2500-I-L), Version 12.1(27b)

Host 2:
2500 Software (C2500-I-L), Version 12.1(27b)

Host 3:
C2600 Software (C2600-IS-M), Version 12.2(15)T13

Switch:
C2950 Software (C2950-I6K2L2Q4-M), Version 12.1(22)EA9

Router:
C2600 Software (C2600-IPBASEK9-M), Version 12.4(17a)


I can pm the full configs or paste them here.

I have search the web hi and low and cant see wy it should not work. Any help please. Thanks

mikej412

Dilbert65 wrote: »

Router:
C2600 Software (C2600-IPBASEK9-M), Version 12.4(17a)

Trunking is supported in the IP Plus (or greater) feature set (on the 2600s starting with version 12.2( 8 )T or greater).

Did your 2600 router allow you create the sub-interfaces with the IP Base feature set?

do a show ip interface brief on the 2600 and see if you have those interfaces and if they are up/up.

mikem2te

As you appear to be using routers for the hosts, I'm wondering if you would have more luck if you replace the "ip default-gateway x.x.x.x" with "ip route 0.0.0.0 0.0.0.0 x.x.x.x" commands on the routers acting as hosts?

Dilbert65

show ip interface brief

FastEthernet0/0.11 172.12.1.1 YES manual up up
FastEthernet0/0.12 172.12.2.1 YES manual up up
FastEthernet0/0.13 172.12.3.1 YES manual up up


Looks good there.


I tried putting in a default route and still a no go. It does not make sense.

hexem

no ip routing

There not dumb host's until you tell them to be.

Dilbert65

Thank You Hexum that did the trick as I put them on the hosts. I put that on the router and did not work so I removed it. I can ping all around now. Thank you. 1 more question for you


What does "no ip routing" do in this case on the hosts?

hexem

no ip routing—Do not run routing protocols. If the destination is not on the same subnet, use ARP and depend on proxies.

Dilbert65

OK When I do a show ip route I get this on host 3

R3#show ip route
Default gateway is 172.12.3.1
Host Gateway Last Use Total Uses Interface
ICMP redirect cache is empty


So with "no ip routing" it does not look at the routing tables and just send the ping on it merry way to the default gateway?

hexem

Yeh, it'll just do what a host would do, if it's not in the same subnet ARP for the default gw's ip address and foward to the router.

Dilbert65

Thank you for command and the background knowledge.