netsniff

Ethernet sniffing utility (QNX)

Syntax:

netsniff [-a src_dst_nid] [-d dst_nid] [-f] [-i] [-L len]
         [-l log_lan] [-m num_Kbytes] [-n num_bytes] [-S]
         [-s src_nid] [-T secs] [-v]

Options:

-a src_dst_nid

Buffer any packets which are addressed to or from the specified physical node ID (src_dst_nid)

-d dst_nid

Buffer only packets which are addressed to the specified physical destination node ID (dst_nid)

-f

Only fill buffer. Instead of the default continuous received packet display (with possible overflows of packet buffer) quit after packet buffer fills.

-i

Instead of the default hex/ASCII packet content display, try to interpret the packet contents.

-L len

Statistics mode; len is the minimum length to display.

-l log_lan

("el") Buffer only packets received from the specified logical LAN. Default is all LANs.

-m num_Kbytes

Allocate num_Kbytes of packet buffer RAM. Default 1024, max 32767, min 64.

-n num_bytes

Display num_bytes of each packet (default 48).

-S

Turn on statistics mode (based on src_nid).

-s src_nid

Buffer only packets which are addressed from the specified physical source node ID (src_nid)

-T secs

Statistics mode; secs specifies the period (default 10 seconds).

Description:

The netsniff utility is an Ethernet network sniffing utility. It has been shipped as a debugging utility should you run into problems using Ethernet.

Figuring out which options to use to specify your src_nid/dst_nid filter looks a bit confusing, but really isn't. Proof by example follows:

If you want to look only at packets transmitted by node 0000c0129e40:

   netsniff -s 0000c0129e40

If you want to look only at packets received by node 0000c0109e40:

   netsniff -d 0000c0109e40

If you want to look only at packets transmitted by node 0000c0129e40 and received by node 0000c0109e40:

   netsniff -s 0000c0129e40   -d 0000c0109e40

If you want to look only at packets transmitted or received by node 0000c0129e40 (this is a popular mode):

   netsniff -a 0000c0129e40