[Redirected to -net] [Category changed to "kern"] On Fri, Nov 30, 2001 at 11:01:56AM +0700, Igor M Podlesny wrote: [...] > [router] > | > X---->|backbone|--> > | > | > Yip1----|the same media|------[some another ip-network] > |ip2----|the same media|------|some box| > > Here is "router" with FreeBSD (OpenBSD, and, probably *BSD) and "Some > box" doing traceroute to (for e.g.) a host which is _reachable_ _via_ > _backbone_. X, Y -- NICs. Y has several IPs, making several > ip-networks on "the same media". > > The problem: traceroute being run on "somebox" will hear respond from > "router" coming from Y.ip1 address which isn't on its (somebox) > IP-network. (well, I deem icmp.echoreply isn't alone in this.) And > this happens because wrong IP-addr is passed to ifaof_ifpforaddr(). My > patch fixes namely this problem -- I have worked out and applied it > and I believe I know what I'm talking about. Look at it, and you'll > realize what I mean... > > You may ask me for details, but, please, don't make different > situations asking me how does it correlate with -- damn lack of > time... > Yeah, now I see what's screwed up. I even thought about this myself this morning (well, you know the saying we use for that :-), before even reading your mail. But your fix is not quite correct, as we may have an individual routing table entry on "router" pointing back to "somebox" with a specific interface address (IFA) given, as reported by the "route -vn get -host <somebox>" command, and we should actually use that as the source. The correct fix is a bit more complicated, and fortunately I have one.
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