Please help: ptp links addresses
Janos Zsako zsako at banknet.net
Fri Jul 12 12:13:10 CEST 1996
> From owner-lir-wg at ripe.net Thu Jul 11 23:01:33 1996 > From: Daniel Karrenberg <Daniel.Karrenberg at ripe.net> Daniel, > Also note that even for private address space traceroute will return the > address correctly, so the diagnostics are useful. There just are no > names. If the border gateways with publicly adressed interfaces has a > reasonable name such as 'bordergw-xxx.clever.net' 'clever-gw.customer.nl' > it is quite clear "where you are" in between. Although I agree in general with your statement above, I think the details are not necessarily true. According to RFC 1918: Because private addresses have no global meaning, routing information about private networks shall not be propagated on inter-enterprise links, and packets with private source or destination addresses ^^^^^^^^^^^^^^^^^^^^^^^^^^^ should not be forwarded across such links. Routers in networks not ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ using private address space, especially those of Internet service providers, are expected to be configured to reject (filter out) routing information about private networks. If such a router receives such information the rejection shall not be treated as a routing protocol error. If an ISP is taking this recommendation by the letter, then they install a filter on the border routers to filter out these packets (as we do ourselves). In this case though, a traceroute from outside will not receive any packets from the interfaces that have a IP address from the private addresse space. I agree however that the answers from the other routers will give you in most of the cases enough information to figure out what route the packets take. Regards, Janos
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