[ewg] Unable to see outbound packets via ibdump

Ravi Chandra Nallan ravi.nallan at gmail.com
Wed Aug 28 07:29:09 PDT 2013


All,
 I am trying to trace the flow of IPoIB packets on a Linux machine (RHEL 5)
using ibdump.
I am plan to filter the packets via tshark by writing the ibdump output to
a pipe. But after the capture, I see that the dump only contains the
incoming packets.

As a test I was running ping from the current machine to another linux
machine, but the captured file only shows incoming icmp reply, but no icmp
requests.

Any suggestions on what could be wrong here?

# rpm -q ibdump
ibdump-1.0.5-4

# rpm -q wireshark
wireshark-1.0.15-5.0.1.el5

# ls -l  /tmp/iblogp
prw-r--r-- 1 root root 0 Aug 28 07:50 /tmp/iblogp

# tshark -V -i /tmp/iblogp > tshark.log &
# ibdump -d mlx4_0 -i 1 -o /tmp/iblogp

# 
egrep 'Local ID|Type:' tshark.log | head -20
        Destination Local ID: 29
        Source Local ID: 76
    Type: 0 (Echo (ping) reply)
        Destination Local ID: 29
        Source Local ID: 76
    Type: 0 (Echo (ping) reply)
        Destination Local ID: 29
        Source Local ID: 76
    Type: 0 (Echo (ping) reply)
        Destination Local ID: 29
        Source Local ID: 76
    Type: 0 (Echo (ping) reply)
        Destination Local ID: 29
        Source Local ID: 76
    Type: 0 (Echo (ping) reply)
        Destination Local ID: 29
        Source Local ID: 76
    Type: 0 (Echo (ping) reply)
        Destination Local ID: 29
        Source Local ID: 76

# grep 'Type:' tshark.log
    Type: 0 (Echo (ping) reply)
    Type: 0 (Echo (ping) reply)
    Type: 0 (Echo (ping) reply)
    Type: 0 (Echo (ping) reply)
    Type: 0 (Echo (ping) reply)
    Type: 0 (Echo (ping) reply)
    Type: 0 (Echo (ping) reply)

-- 
regards,
~Ravi
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