PROBLEM: TCP through vpnx dev stalls

[Andreas Steffan]

Hallo everybody,

I see certain tcp traffing stalling with kernel 3.8.0-22.33 (current
Raring Ringtail version). It is 100% reproducible when I scp a file
(>100 kB) to a machine on the other side. Copying a file of any size in
the other direction (from the remote machine) to my box works fine. I
see somewhat similiar problems doing large HTTP POSTs to the remote
machine or when I run a remote X application.

I tried several versions of openconnect 4.06, 4.07 and 4.99 on linux
3.8.0-22 and see this behaviour with all versions.

On the same system everything works fine by just swapping the kernel
booting to 3.5.0-27.46 (latest from Quantal Quetzal).


Additional information (e.g. tcpdump output) is at launchpad (bug 1185884)
where I originally reported to bug.

Linux mcgyver 3.8.0-23-generic #34-Ubuntu SMP Wed May 29 20:22:58 UTC
2013 x86_64 x86_64 x86_64 GNU/Linux
 
Gnu C                  4.7
Gnu make               3.81
binutils               2.23.2
util-linux             2.20.1
mount                  support
module-init-tools      9
e2fsprogs              1.42.5
jfsutils               1.1.15
reiserfsprogs          3.6.21
xfsprogs               3.1.9
pcmciautils            018
Linux C Library        2.17
Dynamic linker (ldd)   2.17
Procps                 3.3.3
Net-tools              1.60
Kbd                    1.15.5
Sh-utils               8.20
wireless-tools         30
Modules Loaded         nls_utf8 isofs snd_hrtimer pci_stub vboxpci
vboxnetadp vboxnetflt vboxdrv nfnetlink_log nfnetlink ip6table_filter
ip6_t_nat ebtables ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat
nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT
xt_CHECKSUM ipta_tcpudp iptable_filter ip_tables x_tables bridge stp llc
autofs4 deflate zlib_deflate dm_crypt ctr twofish_generic
twofish_x86_64_3way twofishsh_common camellia_generic camellia_x86_64
serpent_sse2_x86_64 serpent_generic glue_helper blowfish_generic

best regards
Andreas

-- 
Andreas Steffan

Achter Billing 14
22399 Hamburg
Germany

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