RE: UDP port 500 traffic from two clients

From: Fernando Cardoso (fernando.cardoso@whatevernet.com)
Date: 01/29/02 

From: "Fernando Cardoso" <fernando.cardoso@whatevernet.com>
To: "Greg A. Woods" <woods@weird.com>, "Toni Heinonen" <Toni.Heinonen@teleware.fi>
Date: Tue, 29 Jan 2002 09:48:56 -0000

[...]
>
> For example when doing remote administration of servers on some remote
> network you should always use SSH, even if you also have a VPN to
> connect your local workstation (and/or local network) to the remote
> network. You should not trust everyone and everything on the remote
> network between its gateway and the remote server(s) you're
> administering. If you don't always use SSH any passwords you type to
> them may be seen by a sniffer on the remote network. The same risks
> apply to using any remote application where you don't want sensitive
> data to be seen or interfered with as it traverses the remote network.

Just a small note on this: you can use IPSec for remote administration of
servers with the same degree of confidence you'd use SSH. I do understand
and agree with Greg's concerns about trusting everything on the remote
network, but you're thinking of IPSec only in terms of tunelling, where you
have a couple of gateways (peers) doing encryption and decryption on behalf
of other hosts. If you use IPSec in transport mode, you'll have end-to-end
encryption between two hosts, which is equivalent to what you'd achieve with
SSH.

Cheers

Fernando 

--
Fernando Cardoso - Security Consultant       WhatEverNet Computing, S.A.
Phone : +351 21 7994200                      Praca de Alvalade, 6 - Piso 6
Fax   : +351 21 7994242                      1700-036 Lisboa - Portugal
email : fernando.cardoso@whatevernet.com     http://www.whatevernet.com/

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