Date: Thu, 27 Aug 2009 21:20:42 -0700 From: "Li, Qing" <qing.li@bluecoat.com> To: "Hiroki Sato" <hrs@freebsd.org>, <qingli@freebsd.org> Cc: freebsd-net@freebsd.org, freebsd-current@freebsd.org Subject: RE: IPv6 regression on 8.x Message-ID: <B583FBF374231F4A89607B4D08578A43052776D0@bcs-mail03.internal.cacheflow.com>
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Hi, The problems you raised: > > 1) Scope violation in a simple global unicast address: > > 2) Issue of subnet-router anycast address with a global address on > another I/F: > The above two issues should be fixed by r196569. Please confirm. > > 3) Manually-configured subnet routes disapper on receiving RA: > I've found the problem and have a fix. I will do some more investigation.=20 Please try the patch at=20 http://people.freebsd.org/~qingli/patch-8-27-ipv6.diff I have done unit testing and RA no longer removes the statically configured prefixes. Thanks, -- Qing > -----Original Message----- > From: owner-freebsd-net@freebsd.org [mailto:owner-freebsd- > net@freebsd.org] On Behalf Of Hiroki Sato > Sent: Wednesday, August 26, 2009 10:27 AM > To: net@freebsd.org; re@freebsd.org > Cc: qingli@freebsd.org > Subject: IPv6 regression on 8.x >=20 > Hi, >=20 > I found there are serious regressions in IPv6 routing on 8.x (and > 7.1R and later) after ARP/NDP changes in the last December. What I > noticed are the following: >=20 > 1) Scope violation in a simple global unicast address: >=20 > # ifconfig em0 inet6 2001:db8:1::1 prefixlen 64 > # ping6 2001:db8:1::1 > PING6(56=3D40+8+8 bytes) 2001:db8:1::1 --> 2001:db8:1::1 > 16 bytes from ::1, icmp_seq=3D0 hlim=3D64 time=3D0.195 ms >=20 > --> 2001:db8:1::1 has a routing entry with lo0, but ::1 should not be > used in the reply packet. On 7.x, 2001:db8:1::1 is used as > expected. >=20 > 2) Issue of subnet-router anycast address with a global address on > another I/F: >=20 > box-1# ifconfig em0 inet6 2001:db8:1::1 prefixlen 64 > box-1# ifconfig em0 inet6 2001:db8:1:: prefixlen 64 anycast > box-2# ifconfig re0 inet6 2001:db8:1::6 prefixlen 64 > box-2# ping6 2001:db8:1:: > PING6(56=3D40+8+8 bytes) 2001:db8:1::6 --> 2001:db8:1:: > 16 bytes from 2001:db8:1::1, icmp_seq=3D0 hlim=3D64 time=3D0.439 ms > ^C > box-1# ifconfig em0 inet6 2001:db8:1::1 prefixlen 64 -alias > box-1# ifconfig em1 inet6 2001:db8:2::1 prefixlen 64 > box-2# ping6 2001:db8:1:: > PING6(56=3D40+8+8 bytes) 2001:db8:1::6 --> 2001:db8:1:: > 16 bytes from fe80::213:a9ff:feff:63e6%re0, icmp_seq=3D0 hlim=3D64 > time=3D0.405 ms > ^C >=20 > --> The em0 and re0 are on the same link with each other. In 7.x, > replies are from 2001:db8:2::1, not fe80::/64. >=20 > 3) Manually-configured subnet routes disapper on receiving RA: >=20 > box-1# ifconfig em0 inet6 2001:db8:1::1 prefixlen 64 > box-1# ifconfig em1 inet6 2001:db8:2::1 prefixlen 64 > box-1# netstat -nrf inet6 | grep ^2001:db8 > 2001:db8:1::/64 link#1 U > em0 > 2001:db8:1::1 link#5 UHS > lo0 > 2001:db8:2::/64 link#6 U > em1 > 2001:db8:2::1 link#5 UHS > lo0 > box-1# sysctl net.inet6.ip6.accept_rtadv=3D1 > box-1# rtsol em0 > box-1# netstat -nrf inet6 | grep ^2001:db8 > 2001:db8:1::1 link#5 UHS > lo0 > 2001:db8:2::1 link#5 UHS > lo0 >=20 > --> This symptom occurs on 7.1R and later, including 8.x and > 9-current, not 7.0R. Even by doing a manual configuration, the > routes on the RA-receiving I/F can not be added. >=20 > I am very concerned that these bugs would disappoint IPv6 users in > production environments if we ship 8.0R without fixing them. >=20 > -- Hiroki
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