I have a sever running Gentoo 2.6.17. The server motherboard is a Tyan
s2891. It has dual Broadcom BCM5704 Gigabit nics. Each nic is auto
sensing 10/100/1000. When the system is connected to a gigabit switch
and a client machine is connected to the same switch via ssh, all is
well. Now when the server is set to 100 full duplex, using ethtool, the
server gets all kinds of read errors on the nic and there is a high
amount of retransmissions.
I need to get the server running at 100 because when it goes into the
datacenter, it will be connected to network gear that only talks 100.
Here is a sniffer trace of the client and server both talking at 1000.
No. Time Source Destination Protocol
Info
5132 276.819056 172.16.1.9 172.16.1.5 SSH
Encrypted response packet len=64
5133 276.819063 172.16.1.5 172.16.1.9 SSH
Encrypted request packet len=80
5134 276.819246 172.16.1.9 172.16.1.5 SSH
Encrypted response packet len=64
5135 276.819252 172.16.1.5 172.16.1.9 SSH
Encrypted request packet len=80
5136 276.819424 172.16.1.9 172.16.1.5 SSH
Encrypted response packet len=48
5137 276.819430 172.16.1.5 172.16.1.9 SSH
Encrypted request packet len=80
5138 276.819638 172.16.1.9 172.16.1.5 SSH
Encrypted response packet len=64
5139 276.819643 172.16.1.5 172.16.1.9 SSH
Encrypted request packet len=80
5140 276.819812 172.16.1.9 172.16.1.5 SSH
Encrypted response packet len=48
5141 276.819818 172.16.1.5 172.16.1.9 SSH
Encrypted request packet len=80
5142 276.820027 172.16.1.9 172.16.1.5 SSH
Encrypted response packet len=48
5143 276.820032 172.16.1.5 172.16.1.9 SSH
Encrypted request packet len=80
5144 276.820205 172.16.1.9 172.16.1.5 SSH
Encrypted response packet len=48
5145 276.820211 172.16.1.5 172.16.1.9 SSH
Encrypted request packet len=80
5146 276.820381 172.16.1.9 172.16.1.5 SSH
Encrypted response packet len=48
5147 276.820386 172.16.1.5 172.16.1.9 SSH
Encrypted request packet len=80
5148 276.855640 172.16.1.9 172.16.1.5 SSH
Encrypted response packet len=1448
5149 276.855761 172.16.1.9 172.16.1.5 SSH
Encrypted response packet len=1448
5150 276.855767 172.16.1.9 172.16.1.5 SSH
Encrypted response packet len=96
5151 276.855770 172.16.1.5 172.16.1.9 TCP
42249 > ssh [ACK] Seq=174432 Ack=203056 Win=537 Len=0 TSV=9386546
TSER=3521416
5152 276.855773 172.16.1.5 172.16.1.9 SSH
Encrypted request packet len=48
5153 276.856229 172.16.1.5 172.16.1.9 SSH
Encrypted request packet len=1360
This is a trace of the server at 100 and the client at 1000.
No. Time Source Destination Protocol
Info
5177 276.861590 172.16.1.5 172.16.1.9 SSH
Encrypted request packet len=80
5178 276.861696 172.16.1.9 172.16.1.5 SSH
Encrypted response packet len=64
5179 276.861702 172.16.1.5 172.16.1.9 SSH
Encrypted request packet len=80
5180 276.897482 172.16.1.9 172.16.1.5 TCP
ssh > 42249 [ACK] Seq=213504 Ack=177120 Win=682 Len=0 TSV=3521421
TSER=9386547
5181 276.903803 172.16.1.9 172.16.1.5 SSH
Encrypted response packet len=1448
5182 276.903809 172.16.1.9 172.16.1.5 SSH
Encrypted response packet len=40
5183 276.903813 172.16.1.5 172.16.1.9 TCP
42249 > ssh [ACK] Seq=177120 Ack=214992 Win=537 Len=0 TSV=9386558
TSER=3521421
5184 276.903991 172.16.1.5 172.16.1.9 SSH
Encrypted request packet len=624
5185 276.903996 172.16.1.5 172.16.1.9 SSH
Encrypted request packet len=80
5186 276.903999 172.16.1.9 172.16.1.5 TCP
ssh > 42249 [ACK] Seq=214992 Ack=177744 Win=705 Len=0 TSV=3521421
TSER=9386558
5187 276.904012 172.16.1.9 172.16.1.5 TCP
ssh > 42249 [ACK] Seq=214992 Ack=177824 Win=705 Len=0 TSV=3521421
TSER=9386558
5188 276.904206 172.16.1.5 172.16.1.9 SSH
Encrypted request packet len=80
5189 276.904217 172.16.1.9 172.16.1.5 TCP
ssh > 42249 [ACK] Seq=214992 Ack=177904 Win=705 Len=0 TSV=3521421
TSER=9386558
5190 276.904764 172.16.1.5 172.16.1.9 SSH
Encrypted request packet len=80
5191 276.904770 172.16.1.9 172.16.1.5 TCP
ssh > 42249 [ACK] Seq=214992 Ack=177984 Win=705 Len=0 TSV=3521421
TSER=9386558
5192 276.906470 172.16.1.5 172.16.1.9 SSH
Encrypted request packet len=80
5193 276.906476 172.16.1.9 172.16.1.5 TCP
ssh > 42249 [ACK] Seq=214992 Ack=178064 Win=705 Len=0 TSV=3521421
TSER=9386559
5194 276.907368 172.16.1.5 172.16.1.9 SSH
Encrypted request packet len=112
5195 276.907374 172.16.1.5 172.16.1.9 SSH
Encrypted request packet len=80
5196 276.907661 172.16.1.5 172.16.1.9 SSH
Encrypted request packet len=176
5197 276.907668 172.16.1.9 172.16.1.5 TCP
ssh > 42249 [ACK] Seq=214992 Ack=178176 Win=705 Len=0 TSV=3521422
TSER=9386559 SLE=178256 SRE=178432
5198 276.908433 172.16.1.5 172.16.1.9 SSH
Encrypted request packet len=912
5199 276.908440 172.16.1.9 172.16.1.5 TCP
[TCP Dup ACK 5197#1] ssh > 42249 [ACK] Seq=214992 Ack=178176 Win=705
Len=0 TSV=3521422 TSER=9386559 SLE=178256 SRE=179344
5200 276.909976 172.16.1.5 172.16.1.9 SSH
Encrypted request packet len=176
5201 276.909982 172.16.1.9 172.16.1.5 TCP
[TCP Dup ACK 5197#2] ssh > 42249 [ACK] Seq=214992 Ack=178176 Win=705
Len=0 TSV=3521422 TSER=9386559 SLE=178256 SRE=179520
5202 276.909986 172.16.1.5 172.16.1.9 SSH
[TCP Fast Retransmission] Encrypted request packet len=80
5203 276.910122 172.16.1.9 172.16.1.5 TCP
ssh > 42249 [ACK] Seq=214992 Ack=179520 Win=705 Len=0 TSV=3521422
TSER=9386559
5204 276.955463 172.16.1.9 172.16.1.5 SSH
Encrypted response packet len=1448
5205 276.955584 172.16.1.9 172.16.1.5 SSH
Encrypted response packet len=1448
5206 276.955590 172.16.1.5 172.16.1.9 TCP
42249 > ssh [ACK] Seq=179520 Ack=217888 Win=537 Len=0 TSV=9386571
TSER=3521426
5207 276.955713 172.16.1.9 172.16.1.5 SSH
Encrypted response packet len=1448
5208 276.955836 172.16.1.9 172.16.1.5 SSH
Encrypted response packet len=1448
5209 276.955841 172.16.1.5 172.16.1.9 TCP
42249 > ssh [ACK] Seq=179520 Ack=220784 Win=537 Len=0 TSV=9386571
TSER=3521426
5210 276.956012 172.16.1.9 172.16.1.5 SSH
Encrypted response packet len=1448
5211 276.956134 172.16.1.9 172.16.1.5 SSH
Encrypted response packet len=1448
5212 276.956139 172.16.1.5 172.16.1.9 TCP
42249 > ssh [ACK] Seq=179520 Ack=223680 Win=537 Len=0 TSV=9386571
TSER=3521426
5213 276.956264 172.16.1.9 172.16.1.5 SSH
Encrypted response packet len=1448
5214 276.956560 172.16.1.9 172.16.1.5 SSH
[TCP Previous segment lost] Encrypted response packet len=1448
5215 276.956566 172.16.1.5 172.16.1.9 TCP
42249 > ssh [ACK] Seq=179520 Ack=225128 Win=537 Len=0 TSV=9386571
TSER=3521426 SLE=226576 SRE=228024
5216 276.956689 172.16.1.9 172.16.1.5 SSH
Encrypted response packet len=1448
5217 276.956694 172.16.1.5 172.16.1.9 TCP
[TCP Dup ACK 5215#1] 42249 > ssh [ACK] Seq=179520 Ack=225128 Win=537
Len=0 TSV=9386571 TSER=3521426 SLE=226576 SRE=229472
5218 276.956867 172.16.1.9 172.16.1.5 SSH
Encrypted response packet len=1448
5219 276.956873 172.16.1.5 172.16.1.9 TCP
[TCP Dup ACK 5215#2] 42249 > ssh [ACK] Seq=179520 Ack=225128 Win=537
Len=0 TSV=9386571 TSER=3521426 SLE=226576 SRE=230920
5220 276.956876 172.16.1.9 172.16.1.5 SSH
Encrypted response packet len=552
5221 276.956879 172.16.1.5 172.16.1.9 TCP
[TCP Dup ACK 5215#3] 42249 > ssh [ACK] Seq=179520 Ack=225128 Win=537
Len=0 TSV=9386571 TSER=3521426 SLE=226576 SRE=231472
5222 276.957097 172.16.1.9 172.16.1.5 SSH
[TCP Fast Retransmission] Encrypted response packet len=1448
5223 276.957102 172.16.1.5 172.16.1.9 TCP
42249 > ssh [ACK] Seq=179520 Ack=231472 Win=496 Len=0 TSV=9386571
TSER=3521426
5224 276.957342 172.16.1.9 172.16.1.5 SSH
Encrypted response packet len=1448
5225 276.957348 172.16.1.5 172.16.1.9 TCP
42249 > ssh [ACK] Seq=179520 Ack=232920 Win=537 Len=0 TSV=9386571
TSER=3521426
Here is the output of netstat:
mercury ~ # netstat -in
Kernel Interface table
Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP
TX-OVR Flg
eth0 1500 0 401 0 0
0 0 0 0 0 BMRU
eth1 1500 0 34385 2084 0
0 57857 0 0 0 BMRU
lo 16436 0 160125 0 0
0 160125 0 0 0 LRU
Any and all suggestions will be greatfully appreciated!
Thanks, Dave
