> When i run tcpdump without any arguments, according to my understanding, it
> is supposed to sniff on all devices.

No.

That's what the version of tcpdump that comes with some versions of
Linux does, but it's not what the version of tcpdump from tcpdump.org
does (even on Linux).

> Can you please tell me how I can listen through all the Network Interface
> Cards on the machine.

Install Linux on the machine (yes, it runs on many Sun machines),
install libpcap 0.6.2/tcpdump 3.6.2, and capture on the "any" device. 
(There is no "any" device on other OSes; it uses a feature specific to
Linux - you can't, on Solaris, open all network interfaces with using a
single DLPI device.)

Or run separate instances of tcpdump on each of the interfaces.

> Should tcpdump detect them all and sniff them simultaniously?

No, it should do what it's always done - sniff on the default device.
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