Re: localhost on Solaris

[ury segal <ury_segal () yahoo com>]

Thanks for the answer!

There is nothing similar to ip_loopback_bypass
in Solaris. 

When I run netstat -i, I do see packets that
are "passed through" the localhost interface.

Is there a real entity in the kernel which is the
loopback interface, may it be a driver (seems not to
be one), STREAMS module, anything?
Does it contain anything beyond statistics ?

--ury





--- rick jones <rick.jones2 () hp com> wrote:

> 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
>
> -
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=====
--ury
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