Date: Fri, 19 Mar 2010 19:27:44 +0900 (JST) From: Yoshiaki Kasahara <kasahara@nc.kyushu-u.ac.jp> To: stable@freebsd.org Subject: TSO and pf(4) reply-to/route-to combination problem Message-ID: <20100319.192744.1739162714673139515.kasahara@nc.kyushu-u.ac.jp>
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Hello, Could anyone who knows the TCP/IP stack well please review kern/144311? In summary, on a multi-homed server I have a trouble when using pf(4) 'reply-to' to return reply packets of incoming TCP connections to the incoming interface. When TSO is enabled on the interface which is used for the default route, redirecting packets to other interfaces using 'reply-to'(or 'route-to') causes massive 'ICMP unreachable - need to frag' storm on lo0 (up to 10Mbytes/sec on my server). The problem doesn't happen when TSO is disabled on the default NIC. I reproduced the problem on msk(4) and em(4), so I guess it is not device specific. http://www.freebsd.org/cgi/query-pr.cgi?pr=144311 Regards, -- Yoshiaki Kasahara Research Institute for Information Technology, Kyushu University kasahara@nc.kyushu-u.ac.jp
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