Date: Thu, 31 Aug 2006 21:05:10 +0200 From: =?ISO-8859-1?Q?Johan_Str=F6m?= <johan@stromnet.org> To: pf@freebsd.org Subject: carp + IPv6 not working at all Message-ID: <D2D6B7D5-FA48-4560-AC2E-1AA8199C03B0@stromnet.org>
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Hi
I'm trying to get carp working with IPv6. For regular IPv4 it works =20
like a charm, but I cannot get it working with inet6. For the moment =20
I've only tested inet6 with a single box:
fxp0: flags=3D8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu =20=
1500
options=3D8<VLAN_MTU>
inet6 fe80::202:55ff:feb1:ff5a%fxp0 prefixlen 64 scopeid 0x1
inet 172.28.1.250 netmask 0xffffff00 broadcast 172.28.1.255
inet6 2001:16d8:ff20:1:202:55ff:feb1:ff5a prefixlen 64 autoconf
inet6 2001:16d8:ff20:1::98 prefixlen 64
ether 00:02:55:b1:ff:5a
media: Ethernet autoselect (100baseTX <full-duplex>)
status: active
carp1: flags=3D49<UP,LOOPBACK,RUNNING> mtu 1500
inet6 2001:16d8:ff20:1::99 prefixlen 64
carp: MASTER vhid 2 advbase 1 advskew 100
Pinging 2001:16d8:ff20:1::98 (fxp0 addr) from other box works fine. =20
However, when i try to ping 2001:16d8:ff20:1::99 (carp1), it does not =20=
realy work:
carpbox# tcpdump -i fxp0 -nveev ip6
tcpdump: listening on fxp0, link-type EN10MB (Ethernet), capture size =20=
96 bytes
19:36:58.150282 00:a0:cc:77:35:ff > 33:33:ff:00:00:99, ethertype IPv6 =20=
(0x86dd), length 86: (hlim 255, next-header: ICMPv6 (58), length: 32) =20=
2001:16d8:ff20:1::1 > ff02::1:ff00:99: [icmp6 sum ok] ICMP6, neighbor =20=
solicitation, length 32, who has 2001:16d8:ff20:1::99
source link-address option (1), length 8 (1): 00:a0:cc:=20
77:35:ff
0x0000: 00a0 cc77 35ff
19:36:58.150393 00:00:5e:00:01:02 > 00:a0:cc:77:35:ff, ethertype IPv6 =20=
(0x86dd), length 86: (hlim 255, next-header: ICMPv6 (58), length: 32) =20=
2001:16d8:ff20:1::98 > 2001:16d8:ff20:1::1: [icmp6 sum ok] ICMP6, =20
neighbor advertisment, length 32, tgt is 2001:16d8:ff20:1::99, Flags =20
[solicited, override]
destination link-address option (2), length 8 (1): =20
00:00:5e:00:01:02
0x0000: 0000 5e00 0102
19:36:58.150642 00:a0:cc:77:35:ff > 00:00:5e:00:01:02, ethertype IPv6 =20=
(0x86dd), length 70: (hlim 64, next-header: ICMPv6 (58), length: 16) =20
2001:16d8:ff20:1::1 > 2001:16d8:ff20:1::99: [icmp6 sum ok] ICMP6, =20
echo request, length 16, seq 0
19:36:59.150566 00:a0:cc:77:35:ff > 00:00:5e:00:01:02, ethertype IPv6 =20=
(0x86dd), length 70: (hlim 64, next-header: ICMPv6 (58), length: 16) =20
2001:16d8:ff20:1::1 > 2001:16d8:ff20:1::99: [icmp6 sum ok] ICMP6, =20
echo request, length 16, seq 1
19:37:00.150360 00:a0:cc:77:35:ff > 00:00:5e:00:01:02, ethertype IPv6 =20=
(0x86dd), length 70: (hlim 64, next-header: ICMPv6 (58), length: 16) =20
2001:16d8:ff20:1::1 > 2001:16d8:ff20:1::99: [icmp6 sum ok] ICMP6, =20
echo request, length 16, seq 2
^C
The other box sends neighbor solicitation "who has", and the carp box =20=
successfully responds with a "tgt is" with correct MAC/IP etc (btw, =20
what is the carp MAC based on?).
After the other box has recieved the adv, it starts to send icmp6 =20
packets.. But for some reason the carpbox does not seem to react to =20
these at all? PF is disabled and I dont use ipfw.
FreeBSD carpbox.stromnet.org 6.1-RELEASE-p5 FreeBSD 6.1-RELEASE-p5 =20
#2: Wed Aug 30 10:22:54 CEST 2006 johan@ carpbox.stromnet.org:/=20
usr/obj/usr/src/sys/DEVBOX i386
(GENERIC + carp+pfsync kernel)
Have I missed something? The same setup works fine with IPv4. Maybe =20
this is related to kern/98622, but I dont see these symptoms =20
described there... Also, I see no ip6 multicast trafik from the box =20
(advertisements), but ip4 is fully visible.
Thanks for any help, carp (at leat for ipv4 :P) rocks! :)
Johan Str=F6m
johan@stromnet.org
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