no ping - 2 routers connected via cross over cable

[witek77]

Hello Everyone.

I have bought 2 cisco 2600 routers. Got them connected with cross over cable, configured the interfaces on both sides and get no ping getting from one side to the other? Can anyone tell me why,please? IP adresses for both connected interfaces are 192.168.2.1 and 192.168.2.2 with 255.255.255.0 mask. I've tried full-duplex and half-duplex. still get no signal either on putty connected to console port on one of them or from laptop connected to the other Ethernet port?

[paul driver]

Hello

Have you tried to change your cable?

Are the ports enabled

int x/x
no shut

[Richard Burts]

It is not clear what is going on here. A good starting point would be to post the output of show interface from both routers.

[witek77]

Will post it tomorrow

[witek77]

Hi,

Here you have copied effects of show interface command on both routers

bartek#show interface

Ethernet0/0 is up, line protocol is down

  Hardware is AmdP2, address is 000a.41d5.5fa0 (bia 000a.41d5.5fa0)

  Description: siec lokalna 192.168.1.0

  Internet address is 192.168.1.1/24

  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,

     reliability 168/255, txload 1/255, rxload 1/255

  Encapsulation ARPA, loopback not set

  Keepalive set (10 sec)

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input never, output 00:00:02, output hang never

  Last clearing of "show interface" counters never

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: fifo

  Output queue :0/40 (size/max)

  5 minute input rate 0 bits/sec, 0 packets/sec

  5 minute output rate 0 bits/sec, 0 packets/sec

     0 packets input, 0 bytes, 0 no buffer

     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

     0 input packets with dribble condition detected

     54 packets output, 3528 bytes, 0 underruns

     54 output errors, 0 collisions, 2 interface resets

     0 babbles, 0 late collision, 0 deferred

     54 lost carrier, 0 no carrier

     0 output buffer failures, 0 output buffers swapped out

Ethernet0/1 is up, line protocol is down

  Hardware is AmdP2, address is 000a.41d5.5fa1 (bia 000a.41d5.5fa1)

  Description: SIEC LOKALNA 192.168.2.0

  Internet address is 192.168.2.2/24

  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,

     reliability 166/255, txload 1/255, rxload 1/255

  Encapsulation ARPA, loopback not set

  Keepalive set (10 sec)

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input never, output 00:00:05, output hang never

  Last clearing of "show interface" counters never

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: fifo

  Output queue :0/40 (size/max)

  5 minute input rate 0 bits/sec, 0 packets/sec

  5 minute output rate 0 bits/sec, 0 packets/sec

     0 packets input, 0 bytes, 0 no buffer

     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

     0 input packets with dribble condition detected

     56 packets output, 3665 bytes, 0 underruns

     56 output errors, 0 collisions, 2 interface resets

     0 babbles, 0 late collision, 0 deferred

     56 lost carrier, 0 no carrier

     0 output buffer failures, 0 output buffers swapped out




witek#show interface

FastEthernet0/0 is up, line protocol is down

  Hardware is AmdFE, address is 000a.b783.a480 (bia 000a.b783.a480)

  Internet address is 192.168.2.1/24

  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

     reliability 255/255, txload 1/255, rxload 1/255

  Encapsulation ARPA, loopback not set

  Keepalive set (10 sec)

  Full-duplex, Auto Speed, 100BaseTX/FX

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input never, output 00:00:02, output hang never

  Last clearing of "show interface" counters never

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: fifo

  Output queue :0/40 (size/max)

  5 minute input rate 0 bits/sec, 0 packets/sec

  5 minute output rate 0 bits/sec, 0 packets/sec

     0 packets input, 0 bytes

     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

     0 watchdog

     0 input packets with dribble condition detected

     42 packets output, 3396 bytes, 0 underruns

     0 output errors, 0 collisions, 1 interface resets

     0 babbles, 0 late collision, 0 deferred

     42 lost carrier, 0 no carrier

     0 output buffer failures, 0 output buffers swapped out

FastEthernet0/1 is administratively down, line protocol is down

  Hardware is AmdFE, address is 000a.b783.a481 (bia 000a.b783.a481)

  Description: siec lokalna 192.168.8.0

  Internet address is 192.168.8.1/24

  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

     reliability 255/255, txload 1/255, rxload 1/255

  Encapsulation ARPA, loopback not set

  Keepalive set (10 sec)

  Full-duplex, Auto Speed, 100BaseTX/FX

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input never, output never, output hang never

  Last clearing of "show interface" counters never

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: fifo

  Output queue :0/40 (size/max)

  5 minute input rate 0 bits/sec, 0 packets/sec

  5 minute output rate 0 bits/sec, 0 packets/sec

     0 packets input, 0 bytes

     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

     0 watchdog

     0 input packets with dribble condition detected

     0 packets output, 0 bytes, 0 underruns

     0 output errors, 0 collisions, 0 interface resets

     0 babbles, 0 late collision, 0 deferred

     0 lost carrier, 0 no carrier

     0 output buffer failures, 0 output buffers swapped out

[Georg Pauwen · Accepted solution]

Hello,

looking at the output:

bartek#show interface

Ethernet0/1 is up, line protocol is down
Ethernet0/1 is up, line protocol is down
Hardware is AmdP2, address is 000a.41d5.5fa1 (bia 000a.41d5.5fa1)
Description: SIEC LOKALNA 192.168.2.0
Internet address is 192.168.2.2/24
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
--> reliability 166/255, txload 1/255, rxload 1/255




witek#show interface

FastEthernet0/0 is up, line protocol is down
Hardware is AmdFE, address is 000a.b783.a480 (bia 000a.b783.a480)
Internet address is 192.168.2.1/24
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
--> Full-duplex, Auto Speed, 100BaseTX/FX

You are connecting a 10MB to a 100MB port. As far as I recall, the 10MB ports only support half duplex, but either way, set the speed and duplex to be the same on both sides (speed/duplex under the interface settings).

Also, the reliability of your Ethernet0 interface is (much) less than 255, which usually indicates a physical problem (either with the cable or with the port). Try another port on the bartek router (preferably a 100MB port).

[Richard Burts]

It is an interesting observation about the difference in speed. I am more concerned about this aspect of the situation

Ethernet0/1 is up, line protocol is down

You could try setting the speed to 10MB (which will prevent negotiation of duplex, resulting in using half duplex) and see if it resolves the issue. I am not optimistic about that. I would suggest trying a different cable for the connection. And perhaps making sure that the cable connects Ethernet0/1 to FastEthernet0/0.

[mlund]

Hi

I'm pretty shure that the problem is speed mismatch.

In routers even today (nexus excluded) the name of the interface specify the maximum speed an interface can have.

Ethernet means 10M, and can't be higher

FastEthernet means 100M, and can often be lowered to 10M with configuration or auto (not if it is fiber connection).

A 10M can't talk to 100M due to different coding on the wires. Although an 100M can often detect that there is an 10M device connected and lower it's speed.

/Mikael

[witek77]

Hello guys,

There wa some kind of a problem with witek 2600 router. I’ve replaced it with a 1700 series one with one FastEthernet port with auto speed and auto-duplex option build in. It works ok, ping gets trough so thank you very much. I changed the cable before and also tried different kind of duplex on both routers but it didn’t work out so as you have advised me  I figured out there must be a problem with port in one of the routers. Now the reliability is 255/255 on both of the routers and ping gets trough so I guess it’s ok. Thank you very much. It’s my first small success in connecting two routers together and configurating it.

But I also have a question. I connected laptop computer to the other Ethernet port on bartek 2600 series router. Ping gets trough from the Ethernet port on laptop to the Ethernet port on the 2600 router but only to this one which is connected to and not the one which connects two routers together and of course it doesn’t get trough to the other router. Same the other way round. Could you please tell me what can be a reason behind it?

I established ip address on Ethernet port on laptop to 192.168.1.100 and 2600 series router interface it is connected to has an address 192.168.1.1

[Georg Pauwen]

Hello,

can you post the configurations (sh run) of both routers ?

[witek77]

startup-config for 1700

adam2#show startup-config

Using 1108 out of 29688 bytes

!

! Last configuration change at 00:20:09 UTC Fri Mar 1 2002

! NVRAM config last updated at 00:20:35 UTC Fri Mar 1 2002

!

version 12.3

service timestamps debug datetime msec

service timestamps log datetime msec

no service password-encryption

!

hostname adam2

!

boot-start-marker

boot-end-marker

!

enable secret 5 $1$QkyI$voMKVJu.dYIPq4BSEc4wn0

enable password router2

!

no aaa new-model

ip subnet-zero

no ip routing

!

!

!

!

no ip cef

ip audit notify log

ip audit po max-events 100

ip ssh break-string

no ftp-server write-enable

no scripting tcl init

no scripting tcl encdir

!

!

!

!

no crypto isakmp enable

!

!

!

!

interface FastEthernet0

 description siec pomiedzy routerami 192.168.2.0

 ip address 192.168.2.1 255.255.255.0

 no ip route-cache

 speed auto

!

interface Serial0

 description polaczenie pomiedzy routerami

 no ip address

 no ip route-cache

 shutdown

 clockrate 4000000

!

ip classless

no ip http server

no ip http secure-server

!

!

!

!

!

control-plane

!

!

line con 0

 password adam_con

 logging synchronous

 login

line aux 0

line vty 0 4

 password adam_vty

 logging synchronous

 login

!

!

end

startup-config for 2600

bartek#show startup-config

Using 1227 out of 29688 bytes

!

version 12.2

service timestamps debug datetime msec

service timestamps log datetime msec

service password-encryption

!

hostname bartek

!

enable secret 5 $1$e3y1$mP5ucOkByHS6hutqhD.BA/

enable password 7 0316541E120A331E

!

ip subnet-zero

no ip routing

!

!

!

!

!

!

!

interface Ethernet0/0

 description siec lokalna 192.168.1.0

 ip address 192.168.1.1 255.255.255.0

 no ip route-cache

 no ip mroute-cache

 half-duplex

 no mop enabled

!

interface BRI0/0

 no ip address

 no ip route-cache

 no ip mroute-cache

 shutdown

!

interface Serial0/0

 no ip address

 no ip route-cache

 no ip mroute-cache

 shutdown

 no fair-queue

!

interface Ethernet0/1

 description SIEC LOKALNA 192.168.2.0

 ip address 192.168.2.2 255.255.255.0

 no ip route-cache

 no ip mroute-cache

 half-duplex

!

ip classless

ip http server

!

!

banner exec ^C

JESTEM BANNER exec POJAWIAM SIE PRZED LOGOWANIEM DO TRYBU UPRZYWILEJOWANEGO ^C

banner login ^C

WITAM JESTEM BANNER login I POJAWIAM SIE PO motd LECZ PRZED LOGOWANIEM ^C

banner motd ^C

Uwaga!!!

Logujsz sie na router. Wszystkie czynnosci sa rejestrowane. ^C

!

line con 0

 exec-timeout 60 0

 password 7 01120205563405002F

 logging synchronous

 login

line aux 0

line vty 0 4

 password 7 111B16100317195F

 login

!

!

end

[Georg Pauwen]

Hello,

on both routers, you need to enable 'ip routing':




Router#conf t

Router(config)#ip routing

[witek77]

Hi,

Thanks a lot. It works now perfectly. I've been capable of checking the ip routes of both routers and adding to 1700 series one the route connecting 2600 router to the laptop computer which is 192.168.1.0. I still have a problem with getting ping trough from 1700 to laptop but it may just be because I've thought the two different kind of hardware supposed to be connected trough normal cable and  I have just read trough that I am supposed use a cross-over cable on Ethernet interface connection like this as well. We'll see.

[Richard Burts]

Thanks for the additional information. Glad to know that adding ip routing has solved most of the problem. 

When connecting a router to a laptop whether it can be done with normal Ethernet cable or needs a cross over cable depends on the model of router (and perhaps version of code that it is running). For newer routers it frequently is possible to use regular Ethernet cable. For routers that are older, like yours are, it is normal to need cross over cable.

[witek77]

Hi,

I've changed the cables. I've also read an article called "how to allow pings ICMP Echo Requests through your Windows Firewall", produced 2 new rules allowing Incoming ICMPv4 and ICMPv6 Echo Requests. So now I can send ping from a distant router 1700 through the 2600 router to laptop and it gets through but the other way round it doesn't. I've thought maybe similar rule regarding outbound traffic will do the trick, so I made 2 additional rules regarding allowing outgoing Echo Requests  both for ICMPv4 and ICMPv6 but no luck, ping from laptop to the 1700 router doesn't get through. Maybe you can help me with that one as well?Regards                              Witek