[Soekris] bad ethernet TX but not RX ?

[Mike Tancsa]

While testing a 4801 as a possible small router / firewall, I ran 
into a strange problem with my test unit.  Sending out sis2 (aka 3rd 
ethernet) would result in sub 1Mb performance, but coming in would 
give normal speeds.  Looking at the switch port there are no errors 
at all.  I swapped out the box for another and all works as 
expected.  Anyone see an ethernet port fail like this ? I know 
anything is possible, but I dont recall ever coming across something like this.


e.g. blasting packets across it on a different unit with the same 
flash gives expected results,

[hq2]# ttcp -f m -s -t 2.2.2.1
ttcp-t: buflen=8192, nbuf=2048, align=16384/0, port=5001  tcp  -> 2.2.2.1
ttcp-t: socket
ttcp-t: connect
ttcp-t: 16777216 bytes in 1.79 real seconds = 71.40 Mbit/sec +++
ttcp-t: 2048 I/O calls, msec/call = 0.90, calls/sec = 1142.38
ttcp-t: 0.0user 0.1sys 0:01real 5% 16i+224d 390maxrss 0+2pf 6095+2550csw
[hq2]#

and the other way

[r2-releng6-64]# ttcp -s -t -f m 1.1.1.2
ttcp-t: buflen=8192, nbuf=2048, align=16384/0, port=5001  tcp  -> 1.1.1.2
ttcp-t: socket
ttcp-t: connect
ttcp-t: 16777216 bytes in 1.75 real seconds = 73.05 Mbit/sec +++
ttcp-t: 2048 I/O calls, msec/call = 0.88, calls/sec = 1168.73
ttcp-t: 0.0user 0.0sys 0:01real 2% 16i+160d 484maxrss 0+2pf 3446+8csw
[r2-releng6-64]#

--------------------------------------------------------------------
Mike Tancsa,                                      tel +1 519 651 3400
Sentex Communications,                            mike at sentex.net
Providing Internet since 1994                    www.sentex.net
Cambridge, Ontario Canada                         www.sentex.net/mike