I'm currently using pppd (2.3.9) on top of ssh to set up a tunnel. The
problem is that pppd chokes when pushed at relatively high transfer
rates (200 Kbps) (the tunnel goes through a series of Eth. links)
leading to a grinding halt. Here is some excerpts from the syslog on
the "client" side of the tunnel:
Oct 19 20:11:24 begonia kernel: ppp: frame with bad fcs, length = 55
Oct 19 20:11:24 begonia kernel: ppp: bad frame, count = 55
Oct 19 20:11:24 begonia kernel: FF 03 00 21 45 AC 1F 8A ...!E...
Oct 19 20:11:24 begonia kernel: 8E 26 38 A8 63 A3 BE DF .&8.c...
Oct 19 20:11:24 begonia kernel: 34 C4 AE D5 B7 99 EC 96 4.......
Oct 19 20:11:24 begonia kernel: A2 69 C5 01 43 1A 4F 5B .i..C.O[
Oct 19 20:11:24 begonia kernel: 71 C8 EF 4F 7D E7 7D 35 q..O}.}5
Oct 19 20:11:24 begonia kernel: A7 81 04 44 FB 72 A7 52 ...D.r.R
Oct 19 20:11:24 begonia kernel: 3D 40 59 E8 7F 35 FE =@Y..5.
Oct 19 20:11:24 begonia kernel: ppp: frame with bad fcs, length = 975
Oct 19 20:11:24 begonia kernel: ppp: bad frame, count = 975
Oct 19 20:11:24 begonia kernel: FF 03 00 95 37 27 3E 4B ....7'>K
Oct 19 20:11:24 begonia kernel: 74 80 1D A0 2D 0D 03 8A t...-...
Oct 19 20:11:24 begonia kernel: 07 42 35 3F 11 FD 97 EC .B5?....
Oct 19 20:11:24 begonia kernel: EC 75 3F 79 EB 61 E6 F9 .u?y.a..
Oct 19 20:11:24 begonia kernel: C8 C7 AA B8 95 CB BC 0C ........
Oct 19 20:11:24 begonia kernel: 01 8C 38 3F DF 1D 31 57 ..8?..1W
Oct 19 20:11:24 begonia kernel: AF D5 AF 78 27 E0 C5 8D ...x'...
[...]
Oct 19 20:11:24 begonia kernel: 27 E5 59 B7 29 A8 7E E2 '.Y.).~.
Oct 19 20:11:24 begonia kernel: 1D 2A 2C 55 C7 76 0E 36 .*,U.v.6
Oct 19 20:11:24 begonia kernel: 6C 74 BA F0 EB FE 69 lt....i
Oct 19 20:11:24 begonia kernel: ppp: frame with bad fcs, length = 54
Oct 19 20:11:24 begonia kernel: ppp: bad frame, count = 54
Oct 19 20:11:24 begonia kernel: FF 03 00 40 A9 E4 50 ED ...@..P.
Oct 19 20:11:24 begonia kernel: 88 C9 48 56 58 78 42 78 ..HVXxBx
Oct 19 20:11:24 begonia kernel: 07 DE D9 D8 69 4F C9 29 ....iO.)
Oct 19 20:11:24 begonia kernel: DF 8A 16 C0 6F E6 9C 3F ....o..?
Oct 19 20:11:24 begonia kernel: A1 19 95 30 46 52 54 BF ...0FRT.
Oct 19 20:11:24 begonia kernel: 20 C4 F0 C7 B8 50 46 81 ....PF.
Oct 19 20:11:24 begonia kernel: 94 84 43 11 DB C1 ..C...
Oct 19 20:11:24 begonia kernel: ppp: frame with bad fcs, length = 977
Oct 19 20:11:24 begonia kernel: ppp: bad frame, count = 977
Oct 19 20:11:24 begonia kernel: FF 03 98 20 FF 5A EC C7 ... .Z..
Oct 19 20:11:24 begonia kernel: FF 9D 3F 86 C1 44 C1 D4 ..?..D..
Oct 19 20:11:24 begonia kernel: E7 45 BD BC 14 E7 EF 1D .E......
Oct 19 20:11:24 begonia kernel: 47 8B 4F 90 A1 45 71 2A G.O..Eq*
Oct 19 20:11:24 begonia kernel: 9F 91 71 57 81 28 D4 DC ..qW.(..
[...]
Oct 19 20:11:24 begonia kernel: 02 55 F4 AC B0 7E E1 98 .U...~..
Oct 19 20:11:24 begonia kernel: F2 4C 9A FB 10 AE BE F7 .L......
Oct 19 20:11:24 begonia kernel: 8D F1 15 65 D5 C7 3F E5 ...e..?.
Oct 19 20:11:24 begonia kernel: 6E 9E C0 18 AD 70 FE E9 n....p..
Oct 19 20:11:24 begonia kernel: 97 BE DE 99 3C 27 D1 76 ....<'.v
Oct 19 20:11:24 begonia kernel: 1A .
Oct 19 20:11:25 begonia kernel: ppp: frame with bad fcs, length = 62
Oct 19 20:11:25 begonia kernel: ppp: bad frame, count = 62
Oct 19 20:11:25 begonia kernel: FF 03 00 21 45 10 04 00 ...!E...
Oct 19 20:11:25 begonia kernel: 7C 04 7E 3B D8 F1 07 FD |.~;....
Oct 19 20:11:25 begonia kernel: 72 C4 EE CA 43 08 77 CA r...C.w.
Oct 19 20:11:25 begonia kernel: 0A 79 09 BA C8 1E D3 05 .y......
Oct 19 20:11:25 begonia kernel: F2 9C 8D 87 10 CA A8 82 ........
Oct 19 20:11:25 begonia kernel: A0 DB E4 CC B8 80 E7 FD ........
Oct 19 20:11:25 begonia kernel: 2F DE D4 CE 0E 62 27 DA /....b'.
Oct 19 20:11:25 begonia kernel: 93 16 42 07 D4 42 ..B..B
Oct 19 20:11:25 begonia kernel: ppp: frame with bad fcs, length = 968
Oct 19 20:11:25 begonia kernel: ppp: bad frame, count = 968
Oct 19 20:15:35 begonia kernel: A4 D2 9C A0 32 DA F6 2C ....2..,
Oct 19 20:15:35 begonia kernel: 11 84 DF CD DD F3 E8 63 .......c
Oct 19 20:15:35 begonia kernel: CB 82 EE 07 D7 43 59 B2 .....CY.
Oct 19 20:15:35 begonia kernel: 7E 67 ~g
[..]
Oct 19 23:48:56 begonia kernel: ppp_ioctl: set flags to f010048
Oct 19 23:48:56 begonia kernel: ppp_ioctl: set flags to f010048
Oct 19 23:48:56 begonia kernel: ppp0: ccp closed
Oct 19 23:48:56 begonia kernel: ppp_ioctl: set flags to f010008
Oct 19 23:48:56 begonia kernel: ppp_ioctl: set flags to f010008
Oct 19 23:48:56 begonia kernel: ppp_tty_ioctl: set xmit asyncmap ffffffff
Oct 19 23:48:56 begonia kernel: ppp_tty_ioctl: set xmit asyncmap ffffffff
Oct 19 23:48:56 begonia kernel: ppp_ioctl: set flags to f010008
Oct 19 23:48:56 begonia kernel: ppp_ioctl: set flags to f010008
Oct 19 23:48:56 begonia kernel: ppp_ioctl: set mru to 5dc
Oct 19 23:48:56 begonia kernel: ppp_ioctl: set mru to 5dc
Oct 19 23:48:56 begonia kernel: ppp_tty_ioctl: set rcv asyncmap 0
Oct 19 23:48:56 begonia kernel: ppp_tty_ioctl: set rcv asyncmap 0
Oct 19 23:48:56 begonia kernel: ppp: channel ppp0 closing.
Oct 19 23:48:56 begonia kernel: ppp: channel ppp0 closing.
Oct 19 23:48:56 begonia kernel: ppp0 released
Oct 19 23:48:56 begonia kernel: ppp0: ccp closed
Oct 19 23:48:56 begonia pppd[1180]: Hangup (SIGHUP)
Oct 19 23:48:56 begonia pppd[1180]: Modem hangup
Oct 19 23:48:56 begonia pppd[1180]: Connection terminated.
Oct 19 23:48:56 begonia pppd[1180]: Connect time 218.7 minutes.
Oct 19 23:48:56 begonia pppd[1180]: Sent 635533 bytes, received 17607675 bytes.
Oct 19 23:48:56 begonia pppd[1180]: Exit.
..And so on. As i suspected some compression problems at high speeds i
turned off all types of compression in pppd. Still no effect. The only thing
that seems that affects this behaviour is diddling w/ the MTU/MRU
values in pppd, hence the values of MTU/MRU of 1024 used above (1024
is making the least problems). So i guess it is a problem w/ pppd handling
different frame sizes/fragmentation & reassembly.
(Note: Looking for alternatives i just saw other people reporting
similar problems. Please take a look at:
http://www.ecf.toronto.edu/~stras/pppoe.html )
Both client and server are running linux 2.2.12 and pppd 2.3.9.
Please advise on how i can nail this down,
Florian.
P.S: Are there any other flavours of pppd out there ?
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