HSI trouble

[John Murphy]

Paul Civati <paul at xciv.org> wrote:

>John Murphy <jfm at blueyonder.co.uk> wrote:
>
>> Can anyone direct me to an explanation why one's first hop should
>> be to a RFC1918 IP;
>
>Sometimes people use these in networks for PtP (Point to Point)
>WAN links on routers, there is some debate as to whether or not
>this is a bad thing, it can cause problems with PMTU (Path MTU
>discovery) since you won't be able to route across the internet
>to these addresses.
>
>> and am I right to deduce that a packet loss of
>> 30 to 40% to this IP and no packet loss to the modem means that all
>> is well with the FreeBSD server at my end and the fault is upstream?
>
>What test did you perform to determine this 30-40% loss?

=46reeBSD ping to the 10.48.0.1 router.

>
>> How can I test and log the link performance without contributing to
>> its failure?
>
>A simple ping to a host (not a router, since some routers will
>de-prioritise and drop some packets destined to them if they are
>busy) should give you an indication of loss.

Well I wrote a little cron job to append date and ping results to a
file overnight, but to the router, though it shouldn't have been busy
between 3am and 6am say.

Here's a sample:

Tue Jun  5 04:10:00 BST 2001
PING 10.48.0.1 (10.48.0.1): 56 data bytes

--- 10.48.0.1 ping statistics ---
16 packets transmitted, 9 packets received, 43% packet loss
round-trip min/avg/max/stddev =3D 10.202/20.876/75.879/20.405 ms
.
Tue Jun  5 04:15:00 BST 2001
PING 10.48.0.1 (10.48.0.1): 56 data bytes

--- 10.48.0.1 ping statistics ---
16 packets transmitted, 10 packets received, 37% packet loss
round-trip min/avg/max/stddev =3D 10.749/24.070/76.517/19.817 ms
.
Tue Jun  5 04:20:00 BST 2001
PING 10.48.0.1 (10.48.0.1): 56 data bytes

--- 10.48.0.1 ping statistics ---
16 packets transmitted, 12 packets received, 25% packet loss
round-trip min/avg/max/stddev =3D 10.393/25.627/77.384/24.151 ms
.
Tue Jun  5 04:25:00 BST 2001
PING 10.48.0.1 (10.48.0.1): 56 data bytes

--- 10.48.0.1 ping statistics ---
16 packets transmitted, 11 packets received, 31% packet loss
round-trip min/avg/max/stddev =3D 10.339/25.552/77.641/21.162 ms
.

>I don't seem to be experiencing any problems with mine.

No, this seems to only effect a few people in this area; and not
even everyone on the same router.

Thanks for your help.
John.