Re: How to complain about slow ISP? Checked in mtr
2008/5/30 Mike Bird <mgb-debian@yosemite.net>:
> If an mtr or traceroute or tracepath, after a sufficient number of
> iterations, looks like this:
>
> HOP1 20% packet loss
> HOP2 30% packet loss
> HOP3 2% packet loss
> ...
>
> - it means that 98-100% of packets are getting to HOP3 and back,
> which means that the packet loss at the earlier hops is probably
> due to high CPU loads or ICMP rate limiting rather than fundamental
> loss of packets in transit. (But there could be more esoteric
> causes such as errors in diverse return routes.)
Hmmm, thanks.
> If you're sending N test packets per second you may be running afoul
> of an ISP's anti-DOS-attack filters. By comparing those results with
> results obtained at N/10 test packets per second, you can determine
> whether this is a likely explanation.
Makes sense.
>> Is there a resource that you could recommend that I read to learn to
>> be more proficient with mtr? Written for silly end-users like me?
>
> Sorry, I don't know of one. "mtr" is a tool. A rough analogy would
> be me asking for instructions on how to use a screwdriver when my
> car is broken. I would need to understand how the car's systems
> work in order to understand how to find out what is wrong and how to
> fix it.
A car analogy! +5 Insightful!
> There are lots of good introductory networking courses available.
> I recommend Cisco's CCNA but you might find others more to your taste.
> I won't pretend that CCNA (or even CCNP) will explain the full
> implications of "mtr" output, but they'll give you enough background
> that you will then be able to understand the implications.
I don't intend to take a course, but the local LUG has been asking
about what topics are of interest today. I will let them know that mtr
and basic networking are interesting. Thanks.
Dotan Cohen
http://what-is-what.com
http://gibberish.co.il
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