CCIE Pursuit Blog

April 28, 2008

Little Green Men In My Router?

This weekend I managed to induce what is now my favorite Cisco error message:

*Mar  2 00:35:32.645: %BGP-6-NEXTHOP: Invalid next hop (254.192.2.52) received from FEC0:234::3: martian next hop

WTF???

Martian packet

In a computer network, packets with source addresses not routable by some computer on a network segment are referred to as martians or “packets from Mars”, on the grounds that they are of no evident “terrestrial” (i.e. normal) source.

Here are a couple of more of my favorite Cisco errors:

My Router Is A Smart-Ass

NTP Can Drive Your Router Insane!!!

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1 Comment »

  1. I’ve stumbled across that error, too. I’ve found that if you do BGP for IPv4 and IPv6, it’s best to do as much as possible for both versions within their own address family config modes. So, for instance, configure your neighbors under BGP, but create both IPv6 and IPv4 address families, and activate the neighbors there.

    Comment by Nick Chandler — April 28, 2008 @ 9:49 am | Reply


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