Date: Tue, 25 Jan 2005 17:08:37 +0100 From: Jeremie Le Hen <jeremie@le-hen.org> To: Jeremie Le Hen <jeremie@le-hen.org>, freebsd-net@freebsd.org Subject: Re: gif(4) and bpf(4) Message-ID: <20050125160837.GG59685@obiwan.tataz.chchile.org> In-Reply-To: <20050125152209.GK47638@dhcp120.icir.org> References: <20050124212011.GC59685@obiwan.tataz.chchile.org> <20050125011615.GB47638@dhcp120.icir.org> <20050125143327.GD59685@obiwan.tataz.chchile.org> <20050125144153.GJ47638@dhcp120.icir.org> <20050125150255.GE59685@obiwan.tataz.chchile.org> <20050125152209.GK47638@dhcp120.icir.org>
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> Interesting. It seems gif isn't passing anything back at all. Can you verify
> that the routes for the addresses you're pinging traverse gif0? I'd
> probably also try csjp@'s bpfstat tool to get a closer look at what's
> going on in bpf.
Yes they are (network on the other side of the tunnel is 192.168.4.0/24) :
%%%
yoda:tools# netstat -rnf inet
Routing tables
Internet:
Destination Gateway Flags Refs Use Netif Expire
default <hidden gw> UGSc 24 17513460 ep0
<hidden net>/24 link#4 UC 1 0 ep0
<hidden ip> 127.0.0.1 UGHS 0 70 lo0
<hidden gw> 00:07:cb:0e:2e:70 UHLW 25 0 ep0 1188
127.0.0.1 127.0.0.1 UH 3 816372 lo0
192.168.0 link#2 UC 1 0 sis1
192.168.0.4 00:a0:cc:da:9f:62 UHLW 2 2188 sis1 625
192.168.1 link#1 UC 6 0 sis0
192.168.1.1 00:09:5b:1a:48:94 UHLW 1 31599 lo0
192.168.1.2 00:09:5b:1a:4f:4d UHLW 0 752 sis0 1199
192.168.1.25 00:04:23:89:e5:84 UHLW 0 562 sis0 353
192.168.1.53 00:04:23:89:e5:84 UHLW 2 167625 sis0 1156
192.168.1.222 00:04:23:89:e5:84 UHLW 2 7601091 sis0 262
192.168.1.255 ff:ff:ff:ff:ff:ff UHLWb 0 15 sis0
192.168.4 192.168.4.13 UGSc 0 691911 gif0
192.168.4.13 192.168.1.1 UH 3 6949 gif0
%%%
I got bpfstat on csjp@'s FreeBSD webpage, but it is designed to work
with devfs. Running RELENG_4, it just does not compile :-(.
> Also try assigning a local address to an instance of gif on the affected
> system and pinging a destination through it using the -r and -S options
> whilst running tcpdump to be sure.
Here is it, with the interface configuration :
%%%
yoda:sys# ifconfig gif0
gif0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1280
tunnel inet <hidden ip> --> <hidden peer ip>
inet6 fe80::209:5bff:fe1a:4894%gif0 prefixlen 64 scopeid 0xa
inet 192.168.1.1 --> 192.168.4.13 netmask 0xffffff00
yoda:sys# ping -r -S 192.168.1.1 192.168.4.13 >/dev/null 2>&1 &
[1] 63095
yoda:sys# /usr/local/sbin/tcpdump -c 2 -ni ep0 'esp'
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on ep0, link-type EN10MB (Ethernet), capture size 96 bytes
17:06:09.008978 IP 82.233.239.98 > 82.66.245.132: ESP(spi=0x0f5d2cbd,seq=0x3a9)
17:06:09.046998 IP 82.66.245.132 > 82.233.239.98: ESP(spi=0x00439e94,seq=0x3a9)
2 packets captured
106 packets received by filter
0 packets dropped by kernel
yoda:sys# /usr/local/sbin/tcpdump -y null -c 2 -ni gif0 'esp'
tcpdump: data link type null
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on gif0, link-type NULL (BSD loopback), capture size 96 bytes
^C
0 packets captured
0 packets received by filter
0 packets dropped by kernel
%%%
> Can you post the revision(s) of the source files? e.g.:
> src/sys/net/if_gif.c
> src/sys/netinet/in_gif.c
> src/sys/netinet6/in6_gif.c
> ...and uname -a?
I already looked on CVSweb, but I saw no relevant commit log.
%%%
yoda:sys# ident net/if_gif.c netinet/in_gif.c netinet6/in6_gif.c
net/if_gif.c:
$FreeBSD: src/sys/net/if_gif.c,v 1.4.2.15 2002/11/08 16:57:13 ume Exp $
$KAME: if_gif.c,v 1.87 2001/10/19 08:50:27 itojun Exp $
netinet/in_gif.c:
$FreeBSD: src/sys/netinet/in_gif.c,v 1.5.2.11 2003/01/23 21:06:45 sam Exp $
$KAME: in_gif.c,v 1.54 2001/05/14 14:02:16 itojun Exp $
netinet6/in6_gif.c:
$FreeBSD: src/sys/netinet6/in6_gif.c,v 1.2.2.7 2003/01/23 21:06:47 sam Exp $
$KAME: in6_gif.c,v 1.49 2001/05/14 14:02:17 itojun Exp $
yoda:sys# uname -a
FreeBSD yoda.tataz.chchile.org 4.10-STABLE FreeBSD 4.10-STABLE #44: Wed Jul 7 03:35:21 CEST 2004 root@yoda.tataz.chchile.org:/usr/src/sys/compile/YODA i386
%%%
> Hope this helps,
I hope too ;-).
Many thanks,
Regards,
--
Jeremie Le Hen
jeremie@le-hen.org
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