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Re: bandwidth measurement
oh well, once using cisco one can utilize cisco network flow
protocol. there is a support for that thing in the tcpdump,
which should make relatively easy to write a straightforward
awk script to parse the tcpdump output.
netflow is also a good way to optimize cisco perfomance, esp
on high-end toys w/ VIPs.
Making, drinking tea and reading an opus magnum from chuck:
> Presuming one "outside" interface handling both Internet and
> WAN, presuming that the CISCOs don't give separate stats (via
> snmp) to each "destination".
> Your main issue will be separating data. MRTG and such simply
> read netstats' output (or the same data) and counts packets
> since the last read.
> One hack might be to set up a second "outside" NIC with a
> different IP and different (duh) ARP address (does OpenBSD allow
> "ifconfig le2 ether 8:0:20:xx:yy:zz"?). Then you have two
> interfaces to read from. One interface handles WAN traffic, one
> handles Internet traffic. Count each separately.
> IPSec is easy this way as well (you measure the IPSec
> 'interface' separately.
> Otherwise you have to figure out which packet is associated with
> which usage. non-trivial at a quick glance.
> Quoting Ryan Permeh (email@example.com):
> > mrtg is a fantastic tool for graphing bandwidth utilization, if the
> > stats can be gathered via snmp, someone has already hacked something to
> > do it, so you can probably get it almost "out of the box" with mrtg.
> > i think there is mrtg in the ports, but since i am not close to my obsd
> > boxen, i'm not positive.
> > firstname.lastname@example.org wrote:
> > >
> > > Hello Everyone,
> > >
> > > I am looking for recommendations for software that will allow
> > > me to find out what percent of my frame connection is being
> > > used for Intranet v/s Internet.
> > >
> > > Any recommendations? We are using Cisco routers for the frame.
paranoic mickey (my employers have changed but, the name has remained)