At 9:42 AM -0500 9/18/06, Dan Nelson wrote:
In the last episode (Sep 17), Paul Hoffman said:
> Greetings again. If I do a 'netstat -I em0 -b', I get:
Name Mtu Network Address Ipkts Ierrs
Ibytes Opkts Oerrs Obytes Coll
em0 1500 <Link#1> 00:0e:0c:67:c8:04 93555198 0
2179562966 114493253 0 723565977 0
em0 1500 fe80:1::20e:c fe80:1::20e:cff:f 0 -
0 4 - 288 -
em0 1500 192.245.12 Balder-227 35399016 -
1770283188 114484197 - 3415268168 -
em0 1500 192.245.12.22 Balder-228 27063120 -
1655024896 0 - 0 -
em0 1500 192.245.12.22 Balder-229 47427840 -
3954775975 18975500 - 2445620452 -
What I care about is the number of input and output bytes (in this
case, 2179562966 and 723565977). I can write a short Perl script to
parse the netstat output, but I would rather just get the numbers
directly from the OS. Are these values available without going
through netstat?
If you use the same code netstat does, yes :) It looks like
per-interface stats are still obtained by grovelling through /dev/kmem,
though, so it may be easier to just parse netstat's output.
Yes, probably so. The quick-and-dirty Perl script I wrote is:
$ThisNetStat = `/usr/bin/netstat -I em0 -b`;
@Lines = split(/^/, $ThisNetStat);
$TheLine = $Lines[1];
$TheLine =~ s/ ( )*/ /g;
@Fields = split(/ /, $TheLine);
$InBytes = $Fields[6];
$OutBytes = $Fields[9];
*However*, I now see that the byte numbers from netstat seem to wrap
around at about 4 gigabytes. I'll have to add some code to handle
that over the long term, given that my system puts out that much in a
day...
Another
alternative would be to install net-snmp and ask it for the stats.
I thought SNMP stood for "Simply Not My Problem"? :-)
--Paul Hoffman
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