I've got one similar to that.
DNS doesn't work.
TCP works okay, but DNS just absolutely fails.
Turns out the Ethernet port is dying on me. I've got extra hardware in the
air, so quick fix is a wireless shot from the AP to the ground to the switch
that feeds the PTP shots.
It'll work until I can fix it properly.
What is happening in my case is the Ethernet is dropping packets, frames,
something. TCP retransmits, UDP just disappears.
Not sure if that will explain your broken download issue, but it is one of
those odd problems.
Could be the server side is just dropping the connection after 100+
retransmits.
----- Original Message -----
From: "Ken Hohhof" <[email protected]>
To: <[email protected]>
Sent: Wednesday, March 04, 2015 10:10 PM
Subject: [AFMUG] downloads stalling but streaming, speedtests, etc. OK
I can't figure this out, but it seems like the sort of thing someone else
here will say "oh, I know what causes that".
I've been tracking a smattering of customer complaints about downloads
just stopping, and finally was able to reproduce it. I Googled for large
file downloads and took the first one that came up:
https://www.futurehosting.com/network-test-files/
and found the downloads would stop repeatedly at the same point.
Different for each file and server location, but the same for repeated
downloads of the same file. For example the 100MB file from Michigan kept
stopping at 8MB. It chugged along fine, then slowed dramatically and
stopped, with no traffic either direction. Yet a ping to the same IP
address never had a problem.
Note it is NOT the computer, the server, or last mile radios. I was able
to see it going only through backhaul radios and routers, no AP/CPE. And
it works fine with the same computer here at my house on AT&T.
Tomorrow I need to chase it back toward my network border. I am not
conversant with Wireshark so have not done that yet, am not looking
forward to it. One pesky customer claims to have done that and seen TCP
retries and out-of-order packets, maybe he's right, maybe he is just
misinterpreting the data.
So .............. what can cause HTTP downloads to stall and stop, while
other stuff like Youtube and Hulu and speedtest.net are fine?
