Re: network interface overruns - how I can get hold of this with snmp?

On 6 April 2012 14:49, Per Jessen <[email protected]> wrote:
> I'm looking for the "overruns:" number as in the ifconfig display:
>
> # ifconfig eth5
> eth5      Link encap:Ethernet  HWaddr 00:02:B3:8D:CF:F6
>           RX packets:2799 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:20 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:168911 (164.9 Kb)  TX bytes:1697 (1.6 Kb)
>
>
> I'll double check if that is what I get in Discards, thanks.

I don't think it is, no.
Looking at the /proc/net/dev format, this looks as follows:


Inter-|   Receive                                                |  Transmit
 face |bytes    packets errs drop fifo frame compressed
multicast|bytes    packets errs drop fifo colls carrier compressed
    lo:27538514  310470    0    0    0     0          0         0
27538514  310470    0    0    0     0       0          0
  eth0:2762421755 80087525    0    0    0     0          0   7286360
3905086444 50271882    0    0    0     0       0          0

It's a little difficult to be sure which zero corresponds with which,
but I strongly suspect that "overruns" in the ifconfig output
corresponds to the "fifo" field in /proc/net/dev

Certainly with the old interface table implementation, this field is skipped.
(Look at the definition of "scan_line_2_2" in mibgroup/mibII/interface.c)
I'm less familiar with the code for the newer re-write, but it looks as
if it's more-or-less the same (see _parse_stats() in
mibgroup/if-mib/data_access/interface_linux.c)

So no - my suspicion is that this particular value is not being reported.

Dave

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