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RCN headache, on day 1



    In a previous episode Sheldon Dubrowin said...
    
    :: I've heard of using net 10 for the loopback addresses of routers,
    :: but not usually in the backbone of a large ISP.
    
    it's done fairly commonly by some pretty big players.. imho it's not
    really a good idea as some big networks filter rfc 1918 addresses at
    ingress and in that case any traffic these routers generate won't get
    back to the hosts on the other networks.. this is a problem with things
    like traceroute and more importantly Path MTU discovery where the
    router must get ICMP back to a host..
    
    but it is quite common.

http://www.ietf.org/rfc/rfc1918.txt

--dan

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