connection stalling mystery

[Arkadiusz Miskiewicz]

Hello

I'm rsyncing files from one machine to another one over internet. I'm rsyncing 
files from machine B to machine A. Connection is initiated on machine A. The 
setup is:

B---internet---UPC-cable_modem--ddwrt--A, ddwrt does nat

A is running current git kernel (from ~2 days ago); IP 193...
B is running 2.6.25.4; IP 192.168...
ddwrt; IP 89.76...

After some time connection stalls and never gets back to working state. I have 
to stop and start rsync again. tcpdump log shows many duplicate ACKs.

tcpdump -w output on machine B:
http://carme.pld-linux.org/~arekm/output.transmiter
and on A:
http://carme.pld-linux.org/~arekm/output.receiver
(both dumps have "host second_side_ip" filter set)

Could anyone look and try to interpret these? What could be the reason for 
stalls?

Note that my ISP is doing weird things like using 10.0.0.0/8 IPs for routing:

  3. 157.25.4.115        0.0%     1     1    0.5   0.5   0.5   0.5   0.0
  4. 195.182.218.12   0.0%     1     1    0.6   0.6   0.6   0.6   0.0
  5. 10.128.11.17        0.0%     1     1    1.1   1.1   1.1   1.1   0.0
  6. 10.139.251.252   0.0%     1     1    6.4   6.4   6.4   6.4   0.0
  7. 89.76.22.19          0.0%     1     1   13.7  13.7  13.7  13.7   0.0

(7 is my box doing nat, dd-wrt 0.24)

Tried with A connected directly to ISP modem (ISP is UPC cable company) but 
that didn't change behaviour (I don't have dumps from that though).
-- 
Arkadiusz MiÅkiewicz        PLD/Linux Team
arekm / maven.pl            http://ftp.pld-linux.org/
--
To unsubscribe from this list: send the line "unsubscribe linux-net" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html