Re: Weird problem, only one port, 80, is blocked.

On Mon, 29 Sep 2008 15:03:39 -0500, ibuprofin@xxxxxxxxxxxxxxxxxxxxxx (Moe Trin) wrote:

On Mon, 29 Sep 2008, in the Usenet newsgroup comp.os.linux.networking, in
article <ctf1e49ihi052o2uq29rjstjrsoltbf7i8@xxxxxxx>, Grant wrote:

This started last Friday, incoming ADSL traffic on port 80 stopped.
So I contact the ISP and they say there's no block, after some days
today we find they can get to my port 80 only from the same CIDR
block (123.2.0.0/15).

What could cause this? The ISP are clueless.

Tracing to your posting address port 80, I loose it in Melbourne:

12 tengigabitethernet8-1.lon55.melbourne.telstra.net (203.50.80.65)
319.114 ms 309.174 ms 309.141 ms
13 dodoau7.lnk.telstra.net (139.130.205.18) 309.124 ms 309.282 ms
309.554 ms
14 * * *
15 * * *
16 * * *

while a trace to the same address port 8080 continues

14 dodomel-lns002-ge3-4-2.core.dodo.com.au (123.2.0.43) 319.122 ms
319.140 ms 319.545 ms
15 123-2-77-8.static.dsl.dodo.com.au (123.2.77.8) [open] 348.964 ms
339.390 ms 339.297 ms

Obviously dodoau7.lnk.telstra.net or dodomel-lns002-ge3-4-2.core.dodo.com.au
is dropping port 80 inbound. Does your contract with Dodo Oz Pty say
that you are to have such access? If so, raise hell with them.

Hey thanks for that, things looking gloomy yesterday as they trying to
blame my linux + bridged modem setup. Yes I'm allowed to run servers,
been with ISP for four years and had web + ftp server up for most of ]
that time.

A bit of good news overnight is that another dodo customer noticed the
same problem and answered my query on a local forum, same symptoms, and
they're running IIS 6.0.

What did you use to trace port 80? tcptraceroute?

Dodo tech seem to have no tools, they're a windoze based company, I'm
only there for the cheap ADSL plan ;)

Your trace shows what I've been trying to tell them since Friday, it
isn't my end playing up, thanks again for this evidence :)

Grant.
--
http://bugsplatter.id.au/
.

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