Greetings,
Some more interesting results, see end of message for traffic dumps.
> The interfaces are:
> BROADCOM Corporation NetXtreme BCM5703
With the IBM xSeries 305 acting as a bridge, I'm seeing TCP Checksum
errors after packets have passed through to bridge.
ssh connection ->
(host.229)--(bridge)--[Hub]--(host.230)
|
(tcpdump)
Traffic dumps were obtained via a forth host connected via a hub,
using tcpdump and then analysed with Ethereal. Both with and without
the bridging host.
dump-with.txt:
-------------
Transmission Control Protocol, Src Port: 32795 (32795), Dst Port: ssh
(22), Seq: 2575813423, Ack: 0, Len: 0
Source port: 32795 (32795)
Destination port: ssh (22)
Sequence number: 2575813423
Header length: 40 bytes
Checksum: 0x16fd (incorrect, should be 0x3b27)
dump-without.txt:
-----------------
Transmission Control Protocol, Src Port: ssh (22), Dst Port: 32797
(32797), Seq: 289612427, Ack: 4286922994, Len: 0
Source port: ssh (22)
Destination port: 32797 (32797)
Sequence number: 289612427
Acknowledgement number: 4286922994
Header length: 40 bytes
Checksum: 0xf71e (correct)
(There was no checksum error observed on packets as they entered the
bridge.)
This look like a driver issue. The next step is to see if the
Broadcom driver has the same (or different issues).
Paul
--
Paul Schulz - Software Engineer [codito, ergo sum]
Foursticks Pty Ltd - 2/259 Glen Osmond Road, Frewville, SA 5063
Phone: +61 8 8338 5500 Fax: +61 8 8338 5511 Mobile: +61 401 981
301
Email: [EMAIL PROTECTED] Web: www.foursticks.com
> To: [EMAIL PROTECTED]
> Cc: [EMAIL PROTECTED]
>
> Greetings,
>
> I'm having an interesting problem with using bridging under 2.4.20, on
> an IBM xSeries 305, using the onboard network interfaces (see below)
>
> I can ping through the bridge (ICMP), but IP packets don't seem to get
> through from other hosts. (eg ssh, and web connections don't
complete.)
>
> eth0: Tigon3 [partno(BCM95703A30) rev 1002 PHY(5703)]
> (PCIX:100MHz:64-bit) 10/100/1000BaseT
> (eth1 is similar)
>
> The driver being used is: tg3 (from the default 2.4.20 kernel).
>
> Has anyone else used bridging with this chipset with success?
>
> Paul
> --
---(dump-with.txt)-----------------------------------------------------
Frame 17 (74 on wire, 74 captured)
Arrival Time: Dec 31, 2002 23:15:18.775372000
Time delta from previous packet: 0.899669000 seconds
Time relative to first packet: 16.903629000 seconds
Frame Number: 17
Packet Length: 74 bytes
Capture Length: 74 bytes
Ethernet II
Destination: 00:02:55:b7:27:f9 (IBM_b7:27:f9)
Source: 00:02:55:b7:27:e1 (IBM_b7:27:e1)
Type: IP (0x0800)
Internet Protocol, Src Addr: 10.130.0.229 (10.130.0.229), Dst Addr:
10.130.0.230 (10.130.0.230)
Version: 4
Header length: 20 bytes
Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
0000 00.. = Differentiated Services Codepoint: Default (0x00)
.... ..0. = ECN-Capable Transport (ECT): 0
.... ...0 = ECN-CE: 0
Total Length: 60
Identification: 0x2291
Flags: 0x04
.1.. = Don't fragment: Set
..0. = More fragments: Not set
Fragment offset: 0
Time to live: 64
Protocol: TCP (0x06)
Header checksum: 0x015d (correct)
Source: 10.130.0.229 (10.130.0.229)
Destination: 10.130.0.230 (10.130.0.230)
Transmission Control Protocol, Src Port: 32795 (32795), Dst Port: ssh
(22), Seq: 2575813423, Ack: 0, Len: 0
Source port: 32795 (32795)
Destination port: ssh (22)
Sequence number: 2575813423
Header length: 40 bytes
Flags: 0x0002 (SYN)
0... .... = Congestion Window Reduced (CWR): Not set
.0.. .... = ECN-Echo: Not set
..0. .... = Urgent: Not set
...0 .... = Acknowledgment: Not set
.... 0... = Push: Not set
.... .0.. = Reset: Not set
.... ..1. = Syn: Set
.... ...0 = Fin: Not set
Window size: 5840
Checksum: 0x16fd (incorrect, should be 0x3b27)
Options: (20 bytes)
Maximum segment size: 1460 bytes
SACK permitted
Time stamp: tsval 81917303, tsecr 0
NOP
Window scale: 0 bytes
Frame 19 (210 on wire, 96 captured)
Arrival Time: Dec 31, 2002 23:15:20.137351000
Time delta from previous packet: 0.260486000 seconds
Time relative to first packet: 18.265608000 seconds
Frame Number: 19
Packet Length: 210 bytes
Capture Length: 96 bytes
Ethernet II
Destination: 00:02:55:b7:27:f9 (IBM_b7:27:f9)
Source: 00:02:55:b7:27:e1 (IBM_b7:27:e1)
Type: IP (0x0800)
Internet Protocol, Src Addr: 10.130.0.229 (10.130.0.229), Dst Addr:
10.130.0.230 (10.130.0.230)
Version: 4
Header length: 20 bytes
Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
0000 00.. = Differentiated Services Codepoint: Default (0x00)
.... ..0. = ECN-Capable Transport (ECT): 0
.... ...0 = ECN-CE: 0
Total Length: 196
Identification: 0xe5a0
Flags: 0x04
.1.. = Don't fragment: Set
..0. = More fragments: Not set
Fragment offset: 0
Time to live: 64
Protocol: TCP (0x06)
Header checksum: 0x3dc5 (correct)
Source: 10.130.0.229 (10.130.0.229)
Destination: 10.130.0.230 (10.130.0.230)
Transmission Control Protocol, Src Port: 32794 (32794), Dst Port: ssh
(22), Seq: 630714440, Ack: 945215028, Len: 144
Source port: 32794 (32794)
Destination port: ssh (22)
Sequence number: 630714440
Next sequence number: 630714584
Acknowledgement number: 945215028
Header length: 32 bytes
Flags: 0x0019 (FIN, PSH, ACK)
0... .... = Congestion Window Reduced (CWR): Not set
.0.. .... = ECN-Echo: Not set
..0. .... = Urgent: Not set
...1 .... = Acknowledgment: Set
.... 1... = Push: Set
.... .0.. = Reset: Not set
.... ..0. = Syn: Not set
.... ...1 = Fin: Set
Window size: 8832
Checksum: 0x1785
Options: (12 bytes)
NOP
NOP
Time stamp: tsval 81918665, tsecr 82640260
Data (30 bytes)
0000 f4 0f eb 20 02 00 21 e8 57 92 86 d8 28 94 0e df ... ..!.W...(...
0010 26 92 dc 7f 0c c6 79 8b 45 c9 5d 50 86 23 &.....y.E.]P.#
Frame 22 (74 on wire, 74 captured)
Arrival Time: Dec 31, 2002 23:15:24.785203000
Time delta from previous packet: 0.908235000 seconds
Time relative to first packet: 22.913460000 seconds
Frame Number: 22
Packet Length: 74 bytes
Capture Length: 74 bytes
Ethernet II
Destination: 00:02:55:b7:27:f9 (IBM_b7:27:f9)
Source: 00:02:55:b7:27:e1 (IBM_b7:27:e1)
Type: IP (0x0800)
Internet Protocol, Src Addr: 10.130.0.229 (10.130.0.229), Dst Addr:
10.130.0.230 (10.130.0.230)
Version: 4
Header length: 20 bytes
Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
0000 00.. = Differentiated Services Codepoint: Default (0x00)
.... ..0. = ECN-Capable Transport (ECT): 0
.... ...0 = ECN-CE: 0
Total Length: 60
Identification: 0x2292
Flags: 0x04
.1.. = Don't fragment: Set
..0. = More fragments: Not set
Fragment offset: 0
Time to live: 64
Protocol: TCP (0x06)
Header checksum: 0x015c (correct)
Source: 10.130.0.229 (10.130.0.229)
Destination: 10.130.0.230 (10.130.0.230)
Transmission Control Protocol, Src Port: 32795 (32795), Dst Port: ssh
(22), Seq: 2575813423, Ack: 0, Len: 0
Source port: 32795 (32795)
Destination port: ssh (22)
Sequence number: 2575813423
Header length: 40 bytes
Flags: 0x0002 (SYN)
0... .... = Congestion Window Reduced (CWR): Not set
.0.. .... = ECN-Echo: Not set
..0. .... = Urgent: Not set
...0 .... = Acknowledgment: Not set
.... 0... = Push: Not set
.... .0.. = Reset: Not set
.... ..1. = Syn: Set
.... ...0 = Fin: Not set
Window size: 5840
Checksum: 0x16fd (incorrect, should be 0x23b7)
Options: (20 bytes)
Maximum segment size: 1460 bytes
SACK permitted
Time stamp: tsval 81923303, tsecr 0
NOP
Window scale: 0 bytes
---(dump-without.txt)--------------------------------------------------
Frame 12 (74 on wire, 74 captured)
Arrival Time: Dec 31, 2002 23:42:17.476332000
Time delta from previous packet: 0.000142000 seconds
Time relative to first packet: 11.274635000 seconds
Frame Number: 12
Packet Length: 74 bytes
Capture Length: 74 bytes
Ethernet II
Destination: 00:02:55:b7:27:e1 (IBM_b7:27:e1)
Source: 00:02:55:b7:27:f9 (IBM_b7:27:f9)
Type: IP (0x0800)
Internet Protocol, Src Addr: 10.130.0.230 (10.130.0.230), Dst Addr:
10.130.0.229 (10.130.0.229)
Version: 4
Header length: 20 bytes
Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
0000 00.. = Differentiated Services Codepoint: Default (0x00)
.... ..0. = ECN-Capable Transport (ECT): 0
.... ...0 = ECN-CE: 0
Total Length: 60
Identification: 0x0000
Flags: 0x04
.1.. = Don't fragment: Set
..0. = More fragments: Not set
Fragment offset: 0
Time to live: 64
Protocol: TCP (0x06)
Header checksum: 0x23ee (correct)
Source: 10.130.0.230 (10.130.0.230)
Destination: 10.130.0.229 (10.130.0.229)
Transmission Control Protocol, Src Port: ssh (22), Dst Port: 32797
(32797), Seq: 289612427, Ack: 4286922994, Len: 0
Source port: ssh (22)
Destination port: 32797 (32797)
Sequence number: 289612427
Acknowledgement number: 4286922994
Header length: 40 bytes
Flags: 0x0012 (SYN, ACK)
0... .... = Congestion Window Reduced (CWR): Not set
.0.. .... = ECN-Echo: Not set
..0. .... = Urgent: Not set
...1 .... = Acknowledgment: Set
.... 0... = Push: Not set
.... .0.. = Reset: Not set
.... ..1. = Syn: Set
.... ...0 = Fin: Not set
Window size: 5792
Checksum: 0xf71e (correct)
Options: (20 bytes)
Maximum segment size: 1460 bytes
SACK permitted
Time stamp: tsval 89550751, tsecr 83539200
NOP
Window scale: 0 bytes
Frame 13 (66 on wire, 66 captured)
Arrival Time: Dec 31, 2002 23:42:17.476437000
Time delta from previous packet: 0.000105000 seconds
Time relative to first packet: 11.274740000 seconds
Frame Number: 13
Packet Length: 66 bytes
Capture Length: 66 bytes
Ethernet II
Destination: 00:02:55:b7:27:f9 (IBM_b7:27:f9)
Source: 00:02:55:b7:27:e1 (IBM_b7:27:e1)
Type: IP (0x0800)
Internet Protocol, Src Addr: 10.130.0.229 (10.130.0.229), Dst Addr:
10.130.0.230 (10.130.0.230)
Version: 4
Header length: 20 bytes
Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
0000 00.. = Differentiated Services Codepoint: Default (0x00)
.... ..0. = ECN-Capable Transport (ECT): 0
.... ...0 = ECN-CE: 0
Total Length: 52
Identification: 0xf5f2
Flags: 0x04
.1.. = Don't fragment: Set
..0. = More fragments: Not set
Fragment offset: 0
Time to live: 64
Protocol: TCP (0x06)
Header checksum: 0x2e03 (correct)
Source: 10.130.0.229 (10.130.0.229)
Destination: 10.130.0.230 (10.130.0.230)
Transmission Control Protocol, Src Port: 32797 (32797), Dst Port: ssh
(22), Seq: 4286922994, Ack: 289612428, Len: 0
Source port: 32797 (32797)
Destination port: ssh (22)
Sequence number: 4286922994
Acknowledgement number: 289612428
Header length: 32 bytes
Flags: 0x0010 (ACK)
0... .... = Congestion Window Reduced (CWR): Not set
.0.. .... = ECN-Echo: Not set
..0. .... = Urgent: Not set
...1 .... = Acknowledgment: Set
.... 0... = Push: Not set
.... .0.. = Reset: Not set
.... ..0. = Syn: Not set
.... ...0 = Fin: Not set
Window size: 5840
Checksum: 0x25b4 (correct)
Options: (12 bytes)
NOP
NOP
Time stamp: tsval 83539200, tsecr 89550751
Frame 14 (105 on wire, 96 captured)
Arrival Time: Dec 31, 2002 23:42:17.477467000
Time delta from previous packet: 0.001030000 seconds
Time relative to first packet: 11.275770000 seconds
Frame Number: 14
Packet Length: 105 bytes
Capture Length: 96 bytes
Ethernet II
Destination: 00:02:55:b7:27:e1 (IBM_b7:27:e1)
Source: 00:02:55:b7:27:f9 (IBM_b7:27:f9)
Type: IP (0x0800)
Internet Protocol, Src Addr: 10.130.0.230 (10.130.0.230), Dst Addr:
10.130.0.229 (10.130.0.229)
Version: 4
Header length: 20 bytes
Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
0000 00.. = Differentiated Services Codepoint: Default (0x00)
.... ..0. = ECN-Capable Transport (ECT): 0
.... ...0 = ECN-CE: 0
Total Length: 91
Identification: 0x4d13
Flags: 0x04
.1.. = Don't fragment: Set
..0. = More fragments: Not set
Fragment offset: 0
Time to live: 64
Protocol: TCP (0x06)
Header checksum: 0xd6bb (correct)
Source: 10.130.0.230 (10.130.0.230)
Destination: 10.130.0.229 (10.130.0.229)
Transmission Control Protocol, Src Port: ssh (22), Dst Port: 32797
(32797), Seq: 289612428, Ack: 4286922994, Len: 39
Source port: ssh (22)
Destination port: 32797 (32797)
Sequence number: 289612428
Next sequence number: 289612467
Acknowledgement number: 4286922994
Header length: 32 bytes
Flags: 0x0018 (PSH, ACK)
0... .... = Congestion Window Reduced (CWR): Not set
.0.. .... = ECN-Echo: Not set
..0. .... = Urgent: Not set
...1 .... = Acknowledgment: Set
.... 1... = Push: Set
.... .0.. = Reset: Not set
.... ..0. = Syn: Not set
.... ...0 = Fin: Not set
Window size: 5792
Checksum: 0x0650
Options: (12 bytes)
NOP
NOP
Time stamp: tsval 89550752, tsecr 83539200
Data (30 bytes)
0000 53 53 48 2d 32 2e 30 2d 4f 70 65 6e 53 53 48 5f SSH-2.0-OpenSSH_
0010 33 2e 34 70 31 20 44 65 62 69 61 6e 20 31 3.4p1 Debian 1
Frame 15 (66 on wire, 66 captured)
Arrival Time: Dec 31, 2002 23:42:17.477613000
Time delta from previous packet: 0.000146000 seconds
Time relative to first packet: 11.275916000 seconds
Frame Number: 15
Packet Length: 66 bytes
Capture Length: 66 bytes
Ethernet II
Destination: 00:02:55:b7:27:f9 (IBM_b7:27:f9)
Source: 00:02:55:b7:27:e1 (IBM_b7:27:e1)
Type: IP (0x0800)
Internet Protocol, Src Addr: 10.130.0.229 (10.130.0.229), Dst Addr:
10.130.0.230 (10.130.0.230)
Version: 4
Header length: 20 bytes
Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
0000 00.. = Differentiated Services Codepoint: Default (0x00)
.... ..0. = ECN-Capable Transport (ECT): 0
.... ...0 = ECN-CE: 0
Total Length: 52
Identification: 0xf5f3
Flags: 0x04
.1.. = Don't fragment: Set
..0. = More fragments: Not set
Fragment offset: 0
Time to live: 64
Protocol: TCP (0x06)
Header checksum: 0x2e02 (correct)
Source: 10.130.0.229 (10.130.0.229)
Destination: 10.130.0.230 (10.130.0.230)
Transmission Control Protocol, Src Port: 32797 (32797), Dst Port: ssh
(22), Seq: 4286922994, Ack: 289612467, Len: 0
Source port: 32797 (32797)
Destination port: ssh (22)
Sequence number: 4286922994
Acknowledgement number: 289612467
Header length: 32 bytes
Flags: 0x0010 (ACK)
0... .... = Congestion Window Reduced (CWR): Not set
.0.. .... = ECN-Echo: Not set
..0. .... = Urgent: Not set
...1 .... = Acknowledgment: Set
.... 0... = Push: Not set
.... .0.. = Reset: Not set
.... ..0. = Syn: Not set
.... ...0 = Fin: Not set
Window size: 5840
Checksum: 0x258b (correct)
Options: (12 bytes)
NOP
NOP
Time stamp: tsval 83539201, tsecr 89550752
Frame 16 (105 on wire, 96 captured)
Arrival Time: Dec 31, 2002 23:42:17.477794000
Time delta from previous packet: 0.000181000 seconds
Time relative to first packet: 11.276097000 seconds
Frame Number: 16
Packet Length: 105 bytes
Capture Length: 96 bytes
Ethernet II
Destination: 00:02:55:b7:27:f9 (IBM_b7:27:f9)
Source: 00:02:55:b7:27:e1 (IBM_b7:27:e1)
Type: IP (0x0800)
Internet Protocol, Src Addr: 10.130.0.229 (10.130.0.229), Dst Addr:
10.130.0.230 (10.130.0.230)
Version: 4
Header length: 20 bytes
Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
0000 00.. = Differentiated Services Codepoint: Default (0x00)
.... ..0. = ECN-Capable Transport (ECT): 0
.... ...0 = ECN-CE: 0
Total Length: 91
Identification: 0xf5f4
Flags: 0x04
.1.. = Don't fragment: Set
..0. = More fragments: Not set
Fragment offset: 0
Time to live: 64
Protocol: TCP (0x06)
Header checksum: 0x2dda (correct)
Source: 10.130.0.229 (10.130.0.229)
Destination: 10.130.0.230 (10.130.0.230)
Transmission Control Protocol, Src Port: 32797 (32797), Dst Port: ssh
(22), Seq: 4286922994, Ack: 289612467, Len: 39
Source port: 32797 (32797)
Destination port: ssh (22)
Sequence number: 4286922994
Next sequence number: 4286923033
Acknowledgement number: 289612467
Header length: 32 bytes
Flags: 0x0018 (PSH, ACK)
0... .... = Congestion Window Reduced (CWR): Not set
.0.. .... = ECN-Echo: Not set
..0. .... = Urgent: Not set
...1 .... = Acknowledgment: Set
.... 1... = Push: Set
.... .0.. = Reset: Not set
.... ..0. = Syn: Not set
.... ...0 = Fin: Not set
Window size: 5840
Checksum: 0x05f8
Options: (12 bytes)
NOP
NOP
Time stamp: tsval 83539201, tsecr 89550752
Data (30 bytes)
0000 53 53 48 2d 32 2e 30 2d 4f 70 65 6e 53 53 48 5f SSH-2.0-OpenSSH_
0010 33 2e 34 70 31 20 44 65 62 69 61 6e 20 31 3.4p1 Debian 1
-----------------------------------------------------------------------
--
Paul Schulz - Software Engineer [codito, ergo sum]
Foursticks Pty Ltd - 2/259 Glen Osmond Road, Frewville, SA 5063
Phone: +61 8 8338 5500 Fax: +61 8 8338 5511 Mobile: +61 401 981
301
Email: [EMAIL PROTECTED] Web: www.foursticks.com
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