04-01-2010 06:35 AM - edited 03-06-2019 10:25 AM
Hi All,
Im wondering if someone is able to help with this one. Please view the debug output below
*Mar 1 05:01:07.270: IP: tableid=0, s=119.118.126.234 (local), d=119.118.126.233 (Vlan1), routed via RIB
*Mar 1 05:01:07.270: IP: s=119.118.126.234 (local), d=119.118.126.233 (Vlan1),
*Mar 1 05:01:07.270: ICMP type=8, code=0
*Mar 1 05:01:07.270: IP: s=119.118.126.234 (local), d=119.118.126.233 (Vlan1),len 100, encapsulation failed
Protocol Address Age (min) Hardware Addr Type Interf
Internet 10.199.39.1 - 9caf.ca44.4998 ARPA Vlan2
Internet 10.199.39.3 0 0003.9d75.20a5 ARPA Vlan2
Internet 119.118.126.233 0 Incomplete ARPA
Internet 119.118.126.234 - 9caf.ca44.4998 ARPA Vlan1
My setup is curentally cabled as follows
<---10.199.20.1--->fe1[Cisco 877] fe0<-----122.41.88.162---------------------122.41.88.163------> [Fiber box with Ethernet cable] > internet
Does anyone have any idea why my cisco router is unable to add a MAC address entry into the ARP table ?
Just an extra note, the interface on the cisco and the fiberbox (direct connection to the ISP) can be plugged into any other device and it works perfectally responding to pings, it just seems to be an issue with the cisco and the fiber ethernet box.
Have tried changing the cable from Straight to Crossover, no luck.
Have tested with another router and it works fine.
Please refer to my earlier post for the running config. https://supportforums.cisco.com/message/3046160#3046160
Thanks,
Nathan
04-01-2010 10:23 AM
Hi All,
Im wondering if someone is able to help with this one. Please view the debug output below
*Mar 1 05:01:07.270: IP: tableid=0, s=119.118.126.234 (local), d=119.118.126.233 (Vlan1), routed via RIB
*Mar 1 05:01:07.270: IP: s=119.118.126.234 (local), d=119.118.126.233 (Vlan1),
*Mar 1 05:01:07.270: ICMP type=8, code=0
*Mar 1 05:01:07.270: IP: s=119.118.126.234 (local), d=119.118.126.233 (Vlan1),len 100, encapsulation failedProtocol Address Age (min) Hardware Addr Type Interf
Internet 10.199.39.1 - 9caf.ca44.4998 ARPA Vlan2
Internet 10.199.39.3 0 0003.9d75.20a5 ARPA Vlan2
Internet 119.118.126.233 0 Incomplete ARPA
Internet 119.118.126.234 - 9caf.ca44.4998 ARPA Vlan1My setup is curentally cabled as follows
<---10.199.20.1--->fe1[Cisco 877] fe0<-----122.41.88.162---------------------122.41.88.163------> [Fiber box with Ethernet cable] > internet
Does anyone have any idea why my cisco router is unable to add a MAC address entry into the ARP table ?
Just an extra note, the interface on the cisco and the fiberbox (direct connection to the ISP) can be plugged into any other device and it works perfectally responding to pings, it just seems to be an issue with the cisco and the fiber ethernet box.
Have tried changing the cable from Straight to Crossover, no luck.
Have tested with another router and it works fine.
Please refer to my earlier post for the running config. https://supportforums.cisco.com/message/3046160#3046160
Thanks,
Nathan
Hi Nathan,
The "encapsulation failed" coming in the log means that the router knows on which interface it has to send the packet, but does not know how to do it.
In order to troubleshoot check out the below things
1.check show arp and check the arp entry of the fiber interface
2.If it is coming incomplete try clear arp in router and ping the fiber interface ip.
3. while pinging just enable debug arp in router,so that what is happening we can see with the logs.
Hope to Help !!
Ganesh.H
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