05-27-2003 12:35 AM - edited 03-02-2019 07:39 AM
Hi all,
I'm just starting out with the whole CCNA thing and I've been playing with Routersim. To start I thought I'd do a basic setup - unfortunately it doesn't seem to work as I expected.
The setup is;
[HOST A - 10.2.0.2/16 GW.10.2.0.1]
||||
[int fastEthernet 0/0 10.2.0.1/16]
[2600 ROUTER]
[int fastEthernet 0/1 10.1.0.1/16]
||||
[HOST B - 10.1.0.2/16 GW 10.1.0.1]
I don't have the IOS config offhand. Basically I've configured the interfaces and made sure they are "no shutdown". I can ping both hosts from the router, which tests the ethernet connectivity. I just can't ping host->host when the traffic traverses the interfaces.
I then thought it'll be because there are no static routes. So I added them;
ip route 10.1.0.0 255.255.0.0 10.1.0.1
ip route 10.2.0.0 255.255.0.0 10.2.0.1
I did a "copy run start" and reloaded the router. Still I cant ping host->host.
When I do a show IP route, it displays the two interfaces and their subnets as connected, it also displays the static routes I've added.
Is this a limitation of the routerSim software and is my config correct? Or have I missed something really obvious?
I havent got access to any "real" routers for another week or so.
All help is appreciated.
05-27-2003 01:50 AM
Ok joey, The static routes are not required. The two networks are directly connected so they should always be routed.
A few thing might be missing:
In the 2600 you may need to specify the encapsulation as these interfaces can also be set up as trunks.
A wrong subnetmask somewhere might be another problem. Please double-check.
Any access-lists still present in the config?
The best test is to do it step by step.
1 From host-A to its default gateway
2 From host-A to router interface 0/1
3 From host-A to host-B
if it fails on
1 check connectivity and IP settings on the host and router int FA0/0
2 check interface status on the router
3 check host-B
Goodluck,
Leo
05-27-2003 02:43 AM
Hi Leo,
Thanks for your reply;
The config is as follows
===================
!
version 12.0
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname Router-2612
!
enable secret xxxxx
!
ip subnet-zero
!
interface FastEthernet0/0
ip address 10.1.0.1 255.255.0.0
no ip directed-broadcast
!
!
interface FastEthernet0/1
ip address 10.2.0.1 255.255.0.0
no ip directed-broadcast
!
interface Serial0/0
no ip address
no ip directed-broadcast
shutdown
!
interface Serial0/1
no ip address
no ip directed-broadcast
shutdown
!
!
no ip classless
!
!
!
line con 0
line aux 0
line vty 0 4
!
end
===================
From HostA :
I can ping its default gateway, I can ping the other interface (0/1), unable to ping HostB
From HostB :
I can ping its default gateway, I can ping the other interface (0/0), unable to ping HostA
So it seems its not routing the traffic out of the opposite interface. I've checked the IPConfigs on both hosts and their IP/Subnets are set correctly.
HostA - 10.1.0.2/16 gw 10.1.0.1
HostB - 10.2.0.2/16 gw 10.2.0.1
The show ip route displays;
====================
Gateway of last resort is not set
10.0.0.0/24 is subnetted, 2 subnets
C 10.2.0.0 is directly connected. FastEthernet0/1
C 10.1.0.0 is directly connected. FastEthernet0/0
====================
By interface encapsulation do you mean PPP, framerelay or suchlike? Would that matter on a plain jane ethernet network?
There are no access lists in place.
The only oddity is when i do a show interface command, interface 0/1 displays a 0.0.0.0 for its internet address, yet shows as 10.2.0.1 in the config and it responds to a ping! There are no duplicate addresses on hosts or anything.
Starting to look like its a routerSim problem, or have i missed something
Thanks again
Joe
05-27-2003 03:13 AM
Hi,
try
ip classless.
This might help.
Regards,
Milan
05-27-2003 03:32 AM
IP clasless will not make a difference as both networks are directly connected. If it does, the simulation is not correct.
Leo
05-27-2003 03:40 AM
Joe,
By encapsulation I mean something like:
encapsulation dot1Q / ISL
As far as I can see, your config should work on a router.
I have no experience with the router simulation software so it could be anything. Most likely it is something with RouterSim.
Leo
05-27-2003 04:00 AM
Joey,
Have you enabled IP Routing?
# conf t
(config)# ip routing
(config)# cntrl-z
# copy run star
#
Hope it helps
rich_sends
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