Re: localhost on Solaris

[rick jones <rick.jones2 () hp com>]

The Solaris and HP-UX 11.X stacks are "cousins" so this may help, it 
may not...

Under HP-UX, if the traffic is to a machine-local IP address, it gets 
looped-back in IP and never gets through DLPI into a driver and so 
cannot be traced with tcpdump.  However, there is an "unsupported" ndd 
tunable called ip_loopback_bypass, which if set to 1 will no longer 
loopback those local IPs in the IP module and the last time I remember 
trying (long ago) allowed tracing with tcpdump.

Now, I'm not sure if/how one wold be able to get that to work with 
"localhost" as long as "localhost" pointed to 127.0.0.1, but perhaps 
some creative use of the route command could get 127.0.0.1 traffic 
routed to a machine local IP address and then if Solaris has something 
akin to the ip_loopback_bypass (check ndd /dev/ip \? output...

hth,

rick jones

PS - anyone tried taking a tcpdump trace where TCP Multi-Data Transmit 
was enbled on Solaris (9 or 10 IIRC)?

Wisdom teeth are impacted, people are affected by the effects of events

-
This is the tcpdump-workers list.
Visit https://lists.sandelman.ca/ to unsubscribe.