Date: Tue, 13 Dec 2011 17:40:49 +1030 From: "Daniel O'Connor" <doconnor@gsoft.com.au> To: Mattia Rossi <mrossi@swin.edu.au> Cc: freebsd-net@freebsd.org Subject: Re: FreeBSD 8 as an IPv6 router Message-ID: <363E3C42-61D6-41BA-AD4A-DE1F178C1770@gsoft.com.au> In-Reply-To: <4EE6F447.1060902@swin.edu.au> References: <2CECE1B6-98B6-4219-BDD7-220F83CAEC36@gsoft.com.au> <4EE6F447.1060902@swin.edu.au>
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On 13/12/2011, at 17:14, Mattia Rossi wrote:
> Start tcpdump on each client e.g. tcpdump -i eth0 -n -s0 -X icmp6 and =
restart rtadvd and see if anything actually arrives at the clients.
>=20
> Then, to make things clean and in order to use the machine as router =
you should disable ACCEPT_RTADV (ifconfig eth0 inet6 -accept_rtadv) and =
also disable the sysctl: sysctl net.inet6.ip6.accept_rtadv=3D0.
OK, I've done that.
> But, I mostly suspect your clients are not getting any RA's...
[midget 17:39] ~ >sudo /usr/sbin/rtadvd -dDf eth0
rtadvd[19142]: <getent> open: No such file or directory
rtadvd[19142]: <getconfig> eth0 isn't defined in the configuration file =
or the configuration file doesn't exist. Treat it as default
rtadvd[19142]: <get_prefix> add 2001:44b8:191:2e00::/60 to prefix list =
on eth0
rtadvd[19142]: <ra_timer_update> RA timer on eth0 is set to 16:0
rtadvd[19142]: <main> set timer to 15:999538. waiting for inputs or =
timeout
rtadvd[19142]: <ra_timeout> RA timer on eth0 is expired
rtadvd[19142]: <ra_output> send RA on eth0, # of waitings =3D 0
rtadvd[19142]: <ra_timer_update> RA timer on eth0 is set to 16:0
rtadvd[19142]: <main> set timer to 16:0. waiting for inputs or timeout
rtadvd[19142]: <ra_input> RA received from fe80::21b:21ff:fe94:ab13 on =
eth0
rtadvd[19142]: <main> set timer to 15:999315. waiting for inputs or =
timeout
[mythtv 17:39] ~ >sudo tcpdump -i eth0 -n -s0 -X icmp6
tcpdump: verbose output suppressed, use -v or -vv for full protocol =
decode
listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
17:39:28.873249 IP6 fe80::21b:21ff:fe94:ab13 > ff02::1: ICMP6, router =
advertisement, length 56
0x0000: 6000 0000 0038 3aff fe80 0000 0000 0000 =
`....8:.........
0x0010: 021b 21ff fe94 ab13 ff02 0000 0000 0000 =
..!.............
0x0020: 0000 0000 0000 0001 8600 fdb9 4000 0708 =
............@...
0x0030: 0000 0000 0000 0000 0101 001b 2194 ab13 =
............!...
0x0040: 0304 3cc0 0027 8d00 0009 3a80 0000 0000 =
..<..'....:.....
0x0050: 2001 44b8 0191 2e00 0000 0000 0000 0000 =
..D.............
The packet appeared when rtadvd printed "rtadvd[19142]: <ra_timeout> RA =
timer on eth0 is expired" (but not right when rtadvd started).
> Mat
>=20
> On 13/12/2011 15:02, Daniel O'Connor wrote:
>> Hi,
>> I have a FreeBSD 8 machine that is my router and I previously had =
IPv6 working. ie it gave out RTADV messages and clients (Windows 7, OSX& =
Ubuntu) got public IPv6 addresses based on the advertised prefix.
>>=20
>> At some stage in the last few months something changed with the =
clients (I haven't updated the base, but ports have been) and they no =
longer seem to accept those messages. (I am guessing somewhat here).
>>=20
>> I am running rtadvd with an empty configuration, and I get my IPv6 =
range by using dhcp6c from my ISP which I connect to via PPPoE using =
PPP.
>>=20
>> [midget 14:29] ~>ifconfig tun0
>> tun0: flags=3D8151<UP,POINTOPOINT,RUNNING,PROMISC,MULTICAST> metric =
0 mtu 1492
>> options=3D80000<LINKSTATE>
>> inet6 fe80::21b:21ff:fe94:ab13%tun0 prefixlen 64 scopeid 0xf
>> inet 118.210.46.156 --> 203.16.215.197 netmask 0xffffffff
>> nd6 options=3D3<PERFORMNUD,ACCEPT_RTADV>
>> Opened by PID 661
>> [midget 14:29] ~>ifconfig eth0
>> eth0: flags=3D8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> =
metric 0 mtu 1500
>> =
options=3D219b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,WOL_=
MAGIC>
>> ether 00:1b:21:94:ab:13
>> inet 10.0.2.1 netmask 0xffffff00 broadcast 10.0.2.255
>> inet6 fe80::21b:21ff:fe94:ab13%eth0 prefixlen 64 scopeid 0x1
>> inet 10.0.2.3 netmask 0xffffffff broadcast 10.0.2.3
>> inet 10.0.2.4 netmask 0xffffffff broadcast 10.0.2.4
>> inet 10.0.2.7 netmask 0xffffffff broadcast 10.0.2.7
>> inet6 2001:44b8:191:2e01:21b:21ff:fe94:ab13 prefixlen 60
>> nd6 options=3D3<PERFORMNUD,ACCEPT_RTADV>
>> media: Ethernet autoselect (1000baseT<full-duplex>)
>> status: active
>>=20
>> [midget 14:29] ~>cat /usr/local/etc/dhcp6c.conf
>> interface eth0 {
>> information-only;
>> };
>>=20
>> interface tun0 {
>> send ia-pd 0;
>> };
>> id-assoc pd {
>> prefix-interface eth0 {
>> sla-id 1;
>> sla-len 4;
>> };
>> };
>>=20
>> I can connect to IPv6 sites from the router just fine.
>>=20
>> Unfortunately I can't find much/any debugging information in the =
clients to tell me why they are not working :(
>>=20
>> I did try a FreeBSD 9.0 box and it similarly didn't work - I had the =
following in rc.conf..
>>=20
>> ipv6_activate_all_interfaces=3D"YES"
>> ipv6_enable=3D"YES"
>>=20
>> Any help appreciated, thanks.
>>=20
>> PS please CC me on replies.
>>=20
>> --
>> Daniel O'Connor software and network engineer
>> for Genesis Software - http://www.gsoft.com.au
>> "The nice thing about standards is that there
>> are so many of them to choose from."
>> -- Andrew Tanenbaum
>> GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C
>>=20
>>=20
>>=20
>>=20
>>=20
>>=20
>> _______________________________________________
>> freebsd-net@freebsd.org mailing list
>> http://lists.freebsd.org/mailman/listinfo/freebsd-net
>> To unsubscribe, send any mail to =
"freebsd-net-unsubscribe@freebsd.org"
>=20
>=20
--
Daniel O'Connor software and network engineer
for Genesis Software - http://www.gsoft.com.au
"The nice thing about standards is that there
are so many of them to choose from."
-- Andrew Tanenbaum
GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C
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