On Wed, Sep 14, 2005 at 04:40:11PM -0500, eric wrote: > On Wed, 2005-09-14 at 23:31:25 +0200, Claudio Jeker proclaimed... > > > The man page is not 100% correct for the unicast case. > > In fact in the unicast case ping just bind()s to the specified address but > > that does not force the packets to go through that interface -- a normal > > route lookup is used to find the outgoing interface. In your case the > > default route which points to bge0. > > I currently think it is not easy to bypass this limitation. > > Hi Claudio, > > I mostly used ping(8) as an example. I notice the same behavior using nmap's > "-S <addr>" flag. This ties into the question I posted yesterday regarding > problems with nmap and nessus. I'm mostly trying to figure out how to > sending *all* packets out only one interface. What if there was no default > route on the host? >
As I said it is not possible to force a outgoing interface without adding a host route to the destionation. The only way to do this is using bpf. For local networks you can use SO_DONTROUTE but this does not work for non local networks. -- :wq Claudio
