IP traffic with destionation addresses that (a) fall within 127/8 and (b) do not match any configured local addresses or aliases will be sent out on the network following the default route, if there is one. This is contrary to the specifications in RFC1122, which states that "addresses of this form MUST NOT appear outside the host". How-To-Repeat: tcpdump whilst ping 127.1.1.1 in an environment where a default exists pointing out the same interface watched by default by tcpdump, and where 127.1.1.1 does not match any locally-configured address or alias. The tcpdump will reveal traffic sent out on the net with destination addresses within 127/8.
Another alternative to patching rc.network, is to define static_routes and add route_loopback to etc/defaults/rc.conf (see attached patch). We may also need do this for IPv6's loopback network. Scot
On Mon, Sep 24, 2001 at 01:40:27PM -0500, Scot W. Hetzel wrote: > Another alternative to patching rc.network, is to define static_routes and > add route_loopback to etc/defaults/rc.conf (see attached patch). > > We may also need do this for IPv6's loopback network. That's a nicer idea than my patch. Joe
State Changed From-To: open->feedback Fixed in 5.0-CURRENT, sys/netinet/ip_output,v 1.148. (Packets with source address of 127/8 are not eligible as well.) MFC in one week.
Responsible Changed From-To: freebsd-bugs->ru
State Changed From-To: feedback->closed Fixed in 4.5-STABLE, sys/netinet/ip_output.c,v 1.99.2.25.