bizare problem with FTP and SCP file transfers

[rick jones]

If you can get the tcpdump traces from either side, we can look at them to see what might be happening. As for why it might affect one TCP stack and not another, it could very well depend on the options in things like the connection establishment SYNchronize segments.

[John O'Neill_6]

Hi All,

Well...here's one for the books, how weird is THIS?

Yesterday the link to our disaster recovery site failed completely, the VPN went down. I rang our ISP and they reported that they could not see a modem/router on the line at the DR site.

I went to the DR site (about a 25km drive) and had a look at the firewall log, it was reporting failure to detect the PPPOE/A login server.

I call the ISP and we go through the usual line test stuff, router in bridged mode, line-synch established by no traffic.

Anyway, Telstra (the ISP's whole-sale provider) end up doing an ADSL port rebuild.
After power cycling our firewall and router again the link comes up.

I was about to do the tcpdump thing when i thought i'd give the file transfer another go.

Guess what?

ALL FILE TRANSFER PROBLEMS HAVE DISAPEARED

How odd... what on earth could have been going on with the DSLAM that could have caused this issue? This issue has taken a turn I didn't expect.

I'll not close this in case the issue comes back, but thought i would post back here with an update.

-John