difference between arp -a & ndd -get /dev/arp arp_cache_report

[Sven Bergmann]

hi,

both commands have different output (with some identical entries). but basically the ndd-command has more output as arp -a.

it seems that for a complete "cache overview" i must use both commands.

whats the difference between these two commands?

[Steven E. Protter]

Shalom Sven,

Run them both, compare the output.

Two different utilities, ndd being HP-UX specific, arp working across platforms.

Both are known to be reliable, but they were designed and implemented by different people for different purposes.

SEP

[Sven Bergmann]

yes i know...in the past i always use both commands for a better overview.

but it interests me why both apps have different results. are there different places in hp-ux for arp cache information? use these two apps different parameters to catch the information?

[mvpel]

Is there any pattern you can discern to the difference between the output? Perhaps the arp command filters out certain kinds of entries such as expired or otherwise invalid ones.