02-12-2012 10:13 AM - edited 03-04-2019 03:14 PM
Hi everyone.
I've set up home lab. I have two routers 1721, 1 switch 2950, PC and 2 laptops.
=================================================================================================
My two routers are connected via serial interface. R2 is directly connected to the PC on FastE 0 192.168.1.2. PC addres 192.168.1.1
Serial int addres 192.168.1.65.
R1 [serial int 192.168.1.66 connected to R2] with FastE 192.168.1.129 is connected to the switch [vlan int 192.168.1.130].
Two laptops are connected to the switch on ports 1 and 2. [192.168.1.131 - 192.168.1.133]
=================================================================================================
The problem I'm having is that I can't ping devices on the other subnets. I have static routing set up on both routers:
R1-
Gateway of last resort is not set
192.168.1.0/24 is variably subnetted, 4 subnets, 2 masks
C 192.168.1.65/32 is directly connected, Serial0
C 192.168.1.64/26 is directly connected, Serial0
S 192.168.1.0/26 [1/0] via 192.168.1.65
C 192.168.1.128/26 is directly connected, FastEthernet0
R2-
Gateway of last resort is not set
192.168.1.0/24 is variably subnetted, 4 subnets, 2 masks
C 192.168.1.64/26 is directly connected, Serial0
C 192.168.1.66/32 is directly connected, Serial0
C 192.168.1.0/26 is directly connected, FastEthernet0
S 192.168.1.128/26 [1/0] via 192.168.1.66
The thing when I'm on R2 I'm able to ping R1, switch and laptops - also my PC.
When I'm on R1 it is the same.
BUT. Whan I'm trying to ping something behind the router while on PC or laptops I'm getting this message:
----Reply from x.x.x.x: Destination host unreachable. - Packets sent=4 , received 4, lost 0---
Also replying address is different from the one I'm pinging.
I have no idea what is going on.
While setting it I was using Packet Tracer as a guide and created exact clone of this network - and a PT net works fine.
I did disable firewalls.
I'm attaching PT file.
Please help !!!
----------------------------------------------------------------------------------
R1 config file:
Current configuration : 890 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname Router-1
!
boot-start-marker
boot-end-marker
!
enable secret 5 $1$q0Qj$8hrfpMXpSj4Xr96xFAhyM0
!
no aaa new-model
ip cef
!
!
!
!
!
multilink bundle-name authenticated
!
!
!
!
!
archive
log config
hidekeys
!
!
!
!
!
!
!
interface FastEthernet0
ip address 192.168.1.129 255.255.255.192
speed auto
!
interface Serial0
ip address 192.168.1.66 255.255.255.192
encapsulation ppp
no fair-queue
!
ip forward-protocol nd
ip route 192.168.1.0 255.255.255.192 192.168.1.65
!
!
no ip http server
no ip http secure-server
!
!
!
!
control-plane
!
banner motd ^C
==================
Router-1!!!!!!!!!!
==================
^C
!
line con 0
password 7 0202114B0A
logging synchronous
login
line aux 0
line vty 0 4
password 7 1413071B0D
logging synchronous
login
!
end
++++++++++++++++++++++++++++++++++++++++++++++++++++++++
R2 config file.
Current configuration : 968 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname Router-2
!
boot-start-marker
boot-end-marker
!
enable secret 5 $1$H2IG$EsBXfuVE3BbB96tJWpoBF1
!
no aaa new-model
ip cef
!
!
!
!
!
multilink bundle-name authenticated
!
!
!
!
!
archive
log config
hidekeys
!
!
!
!
!
!
!
interface ATM0
no ip address
shutdown
no atm ilmi-keepalive
dsl operating-mode auto
!
interface FastEthernet0
ip address 192.168.1.2 255.255.255.192
speed auto
!
interface Serial0
ip address 192.168.1.65 255.255.255.192
encapsulation ppp
no fair-queue
clock rate 2000000
!
ip forward-protocol nd
ip route 192.168.1.128 255.255.255.192 192.168.1.66
!
!
no ip http server
no ip http secure-server
!
!
!
!
control-plane
!
banner motd ^C
==============
Router-2!!!!!!
==============
^C
!
line con 0
password 7 045F1E160E
logging synchronous
login
line aux 0
line vty 0 4
password 7 130102020A
login
!
end
Solved! Go to Solution.
02-12-2012 02:20 PM
Hi,
just send the debugs to the buffer:
logging buffered debug
logging buffered 10000
no service timestamp debug
do sh log
and you'll see the logs from the debug there.
Regards.
Alain
02-19-2012 01:03 PM
Routing is good, you have a PC issue or some crazy filtering going on that I am not seeing.
02-19-2012 01:20 PM
Hello
Just run it on R1. Traffic gernerated on hosts behind R1.
Toshi
Sent from Cisco Technical Support iPhone App
02-19-2012 03:44 PM
Strange. It looks ok on PT.
Can you post the output of "sh controllers serial 0" and "sh int s0" of both routers?
02-12-2012 10:36 AM
Hi,
It should not be a problem.
- Make sure that hosts behind R1 configured a gateway-192.168.1.129
- Make sure that hosts behind R2 configured a gateway-192.168.1.2
- Turn off personal firewall on hosts for testing.
"Destination host unreachable" tells you that the routing problem should be considered.
HTH,
Toshi
02-12-2012 10:43 AM
Hi
Thank for quick replay.
Default gateways are already set up.
And firewall is disabled on both laptops and PC.
Everything looks OK but - there is something.
02-12-2012 10:46 AM
Hi
Try to test from hosts behind R1 to connect hosts behind R2.
Please post the output of "debug ip routing" on R1 and R2.
Toshi
02-12-2012 11:40 AM
How do I do it exactly?
After typing -
debug ip routing
all I'm getting on the router is : IP routing debugging is on
Thanks.
02-12-2012 11:48 AM
Hi,
How do you manage the devices? Console or Telnet?
R1#conf t
R1(conf t)#logg cons 7
R1#debug ip routing
R2#conf t
R2(conf t)#logg cons 7
R2#debug ip routing
Then generate traffic from hosts between R1 and R2.
Toshi
02-12-2012 12:10 PM
I'm using telnet.
02-12-2012 10:56 AM
Hi,
the output of show ip route doesn't correspond to the configs because in the routing table the static routes have the connected interface IP as next-hop but they should have the next-hop IP like it is done in the config
Regards.
Alain
02-12-2012 11:47 AM
Hi
What do you mean exactly by 'not coresspond'''?
How I supose to change it?
Thats the command I ve used on Router 1
---ip route 192.168.1.0 255.255.255 192.168.1.65---
and thats the one I've used on router 2
---ip route 192.168.1.128 255.255.255.192 192.168.1.66
I thought after doing this routers should route between subnets.
What should i change?
Thanks.
02-12-2012 11:50 AM
Hi,
I thought that peer neighbor route of PPP should not kill your routing. All right lets see the output of debug.
Toshi
02-12-2012 12:21 PM
Are these commands going to be different if I'm using telnet?
and also where do i find the output of this debug?
Thanks a lot.
02-12-2012 02:20 PM
Hi,
just send the debugs to the buffer:
logging buffered debug
logging buffered 10000
no service timestamp debug
do sh log
and you'll see the logs from the debug there.
Regards.
Alain
02-13-2012 05:04 AM
To enabled logging to your telnet session:
conf t
logging mon
exit
term mon
Your config looks fine, something else is wrong. Maybe missing a crossover on the handoff to the PC or something. Do the following:
From R1
ping 192.168.1.66
if it fails, check your T1 crossover cable
From R1:
ping 192.168.1.129
if it fails, it is the route ON this router that is wrong
From R1
ping 192.168.1.129 source Fast0
if the previous works but this fails it is the route on R2 that is wrong
If all successfull, you have a PC issue. VLAN the switch out and connect to the switch, then the router as opposed to cross connecting directly. I don't know that 1721's support auto-mdix.
02-12-2012 03:06 PM
Hi,
Try "clear ip route *" and shut and open the serial interface.
Also try changing the ip route statements to use the exit interface
ip route x.x.x.x x.x.x.x serial 0
Hope this helps
Eugen
02-13-2012 11:54 AM
Thanks a lot guys
I don't know where to start from now ;]
OK. I changed routing on both R1 and R2 so now they using Serial 0 to forward traffic.
And now from laptop .133 i can ping everything on this side plus 192.168.1.66.
Whan i try to ping .65 BANG! host unreachable.
From PC .1 I'm able to ping .2 interface of R2 but not the .65.
I'm a really fresh to CISCO but i'm almost certain that there is a problem with Serial 0 int on R2.
I will try to setup these logs now- i never done it before so it may take me a while.
update-
I just tried to ping .2 and .65 from R1. It works fine.
?????????????????????????????????????????
Thanks again.
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide