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Subject"No buffer space available" on 2.6.0-test2-mm2 trying to create sit-mode tunnel
Hi:

Doing some tests with 2.6.0-test2-mm2 and IPv6 over IPv4 tunnels I come
across the error message in the subject:

dardhal:~# ip tunnel add sixbone mode sit remote 64.71.xxx.xxx local 213.0.xxx.xxx ttl 255
ioctl: No buffer space available

Tracing the previous command shows the following (relevant part only):
socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 3
ioctl(3, 0x89f1, 0xbffff7d8) = -1 ENOBUFS (No buffer space available)
dup(2) = 4
fcntl64(4, F_GETFL) = 0x2 (flags O_RDWR)
brk(0) = 0x805e000
brk(0x805f000) = 0x805f000
brk(0) = 0x805f000
fstat64(4, {st_mode=S_IFCHR|0600, st_rdev=makedev(136, 4), ...}) = 0
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40012000
_llseek(4, 0, 0xbffff5f0, SEEK_CUR) = -1 ESPIPE (Illegal seek)
write(4, "ioctl: No buffer space available"..., 33ioctl: No buffer space available
) = 33
close(4) = 0
munmap(0x40012000, 4096) = 0
close(3) = 0
exit_group(-1) = ?

This same command has worked for me previously, even after several IP changes
(local tunnel enpoint on a dynamic IP). Maybe I am doing something wrong,
but my box configuration seems to be the same as it was some hours ago.

Some (hopefully) useful data follows:
# ip -6 link show
3: sit0: <NOARP> mtu 1480 qdisc noop
link/sit 0.0.0.0 brd 0.0.0.0
6: sixbone@NONE: <POINTOPOINT,NOARP,UP> mtu 1504 qdisc noqueue
link/sit 213.0.xxx.xxx peer 64.71.xxx.xxx
7: ppp0: <POINTOPOINT,MULTICAST,NOARP,UP> mtu 1524 qdisc sfq qlen 3
link/ppp

# ip -4 address show
7: ppp0: <POINTOPOINT,MULTICAST,NOARP,UP> mtu 1524 qdisc sfq qlen 3
inet 213.0.xxx.xxx peer 213.0.xxx.xxx/32 scope global ppp0

# ip -6 address show
6: sixbone@NONE: <POINTOPOINT,NOARP,UP> mtu 1504 qdisc noqueue
inet6 2001:470:1f00:xxxx::xxxx/127 scope global
inet6 fe80::d500:c95d/128 scope link

# ip -6 tunnel show
sit0: ipv6/ip remote any local any ttl 64 nopmtudisc
sixbone: ipv6/ip remote 64.71.xxx.xxx local 213.0.xxx.xxx ttl 255

I don't know what other information could be of interest, but just ask.

Regards,

--
Jose Luis Domingo Lopez
Linux Registered User #189436 Debian Linux Sid (Linux 2.6.0-test2-mm2)
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