[Outages-discussion] [outages] comcast/sprint oddities

[Jeremy Chadwick]

On Wed, Mar 13, 2013 at 11:13:34AM -0700, Constantine A. Murenin wrote:
> On 13/03/2013, Jay Ashworth <jra at baylink.com> wrote:
> > ----- Original Message -----
> >> From: "Jeremy Chadwick" <jdc at koitsu.org>
> >
> >> I would recommend setting up scripts/tools that run mtr from a cronjob
> >> and save the output to a file, and do this on hosts at both ends of
> >> the network (the Comcast end, and the Sprint end).
> >
> > And the recommended approach is:
> >
> > # mtr -rwc 10 $HOST
> > # mtr -rwcn 10 $HOST
> >
> > (Alas, mtr won't show both the name and IP, even in report modes; I will
> > eventually get sick enough of that to patch it.  Yes, local misconfigs
> > that cause bad DNS resolution need to be visible in such report output.)
> >
> > Note that mtr needs to be both setUID root *and* executable by Other
> > in order to work for others than root, assuming you need that.  Neither
> > is default.
> 
> you must have a weird OS; on mine, it's the default:
> 
> -r-sr-xr-x  1 root  bin  63016 Jul 31  2012 /usr/local/sbin/mtr
> 
> Also, any patches to make `--order "SRL BGAWV"` the default when in
> `--report` mode?  Otherwise, the output is pretty much unreadable.

Is there a reason you can't specify --order when using --report?  I've
been using this for years reliably in my monitoring shell scripts:

/usr/local/sbin/mtr -n --order=LSRNABW --report --report-cycles=40

-- 
| Jeremy Chadwick                                   jdc at koitsu.org |
| UNIX Systems Administrator                http://jdc.koitsu.org/ |
| Mountain View, CA, US                                            |
| Making life hard for others since 1977.             PGP 4BD6C0CB |