Diagnosing connection issue

[Jerry Feldman]

On 02/15/2011 03:53 PM, Bill Bogstad wrote:
> On Tue, Feb 15, 2011 at 11:55 AM,  <edwardp-jjFNsPSvq+iXDw4h08c5KA at public.gmane.org> wrote:
>> This happens with both Linux and Windows, so it cannot be system
>> software if two operating systems are involved.
> To be fair, both systems could have something wrong with them.   Given
> that the more straightforward causes are being eliminated more
> atypical reason have to be
> considered.   Trying a recent Linux LiveCD of some sort to check on
> this possibility is one option.
>
> Some more ideas:
>
> 1. Maybe pings work because they are small packets.   Maybe something
> is flaky in handling full size packets.  Try specifying packet sizes
> to ping (ping -s).
> 2. Check stats on your network card with "ifconfig" to look for
> errored or dropped packets.  If your home router has a status page
> with similar info check that as well.
Ping uses a different IP protocol, ICMP. HTTP uses TCP which requires a
bit more overhead to establish the connection. You can also detect the
name lookup with ping if you have lookup issues. Yesterday I was
researching an issue with a virtual machine, and it ended up as a typo
in the DNS. A simple ping was the clue.

--=20
Jerry Feldman <gaf-mNDKBlG2WHs at public.gmane.org>
Boston Linux and Unix
PGP key id: 537C5846
PGP Key fingerprint: 3D1B 8377 A3C0 A5F2 ECBB  CA3B 4607 4319 537C 5846



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