Hi, What is the advice on scrubbing IPv6 packets in PF?
I've come across three bugs in pf that caused legitimate IPv6 to be dropped: * "scrub fragment reassemble" drops all IPv6 fragments. (PF in OpenBSD 5.0 has fixed this, but FreeBSD 9.2 unfortunately still seems to use the PF version of OpenBSD 4.5). (http://www.freebsd.org/cgi/query-pr.cgi?pr=124933) * "scrub reassemble tcp" is causing a ~30 second delay in setting up a SSH connecting to a server with a pf firewall. In TCPdump I see a large number of TCP retransmissions from the client to the server after the SYN ACK packet. I have not dived into the specifics, but turning this option off fixed things. (http://www.freebsd.org/cgi/query-pr.cgi?pr=172648) * IPv6 traffic over the loopback interface (lo0) generally is reported as traversing a non-loopback interface. I've first come across this in ipfw, but since the bug is in the kernel, it applies to PF as well. (http://www.freebsd.org/cgi/query-pr.cgi?pr=165190) While these are the only pf/IPv6 bugs I've encountered since I started using FreeBSD about 2 years ago now, and switched to PF last month, I see more potential problems, like #169630 (though that's not IPv6 specific). Rather than waiting for me to bump into the next IPv6 bug, I try to understand the current limitations of IPv6 support in PF. In particular, what is the recommended scrubbing for IPv6 packets? I currently have: scrub ipv4 fragment reassemble reassemble tcp random-id scrub ipv6 fragment reassemble random-id pass quick inet6 proto ipv6-frag all Is this recommended? A small question about the bug database: Is there a way to 'follow' certain bug reports (i.e. get email upon comments or state changes)? Bugs #165190 and #169630 have patches for over a year (even though the later has no '[patch]' tag yet); what is the general way to raise awareness of these bugs so they are applied to a next version of FreeBSD? Regards, Freek Dijkstra _______________________________________________ freebsd-pf@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-pf To unsubscribe, send any mail to "freebsd-pf-unsubscr...@freebsd.org"
