When i try to capture aix server network packats from Ethernet interface i got the Do not specify an existing file error message.
Error Message :
Problem Identification :
Previously i run iptrace utility for capture the network packets, but it’s still running on background.
That’s why i got the this kind of error.
Need to check iptrace utility process status.
if it is running stop the iptrace process.
Again start the iptrace service and check the service status using.
Try to capture the network packates using tcpdump utility.
Then also getting same error message Do not specify an existing file.
Resolve actual Problem:
first we need to find out how many network interface configured on our aix server.
Above tcpdump output showing only one interface but that is loop back logical network interface .
but we did not get the real network interface from that output. it means some other network packet capture utility using that interface so we have to release that interface.
-u –> Unloads the kernel extension that was loaded by the iptrace daemon at startup.
Successfully unloaded the iptrace utility now we can check how many interfaces are available.
Now we start the network packates using tcpdump command it should work.