* Tim Newsham <Pine.BSI.4.61.0506141513050.28194@xxxxxxxxxxxxxxxxx> 2005-06-14 15:15 > >> $ nc -g A -g B C 3333 > >> I see packets forwarded over lo to A, and no further packets > >> are sent over lo or eth0. Machines B and C receive no packets. > > > >A 127.0.0.1 source address is considered martian by the source > >validation code as proposed by rfc1812. You should see warnings > >in the console if you have martian logging enabled. > > I see the same behavior when the source address is explicitely bound > to an address belonging to a local NIC (-s option to netcat). Since your local address is not a unicast you'll run into the same martian rule as below. > >A will do a route lookup of [src=A dst=A] which results in your > >local route being returned. Again this violates rfc1812 because > >that route will not be a unicast route but a local one. A martian > >source warning should be logged if enabled. > > Is there any way to enable routing for this case? This is a > desirable source route at times. I would hate to have to boot > FreeBSD every time I want to use this feature. I can only think of one way which is to change fib_validate_source() and have it accept RTN_LOCAL routes as well, i.e. change if (res.type != RTN_UNICAST) into if (res.type != RTN_UNICAST && res.type != RTN_LOCAL) I'm not sure if this breaks other code though. - : send the line "unsubscribe linux-net" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
