DHCP & remote ssh logins

DHCP & remote ssh logins

[Phil Rhoades]

People,

If iptables are setup to only accept ssh logins from particular IPs, how
do people login when they are on the move and have a DHCP allocated IP?

I thought I could do this by sending a mail (from the remote DHCP IP)
formatted in a particular way, to a particular user on the destination
server which would then be processed, which would then cause a change to
the iptables setup.  However, I assume other people have had to solve
this problem and I don't want to re-invent wheels . .

Suggestions appreciated!

Regards,

Phil.
-- 
Philip Rhoades

Pricom Pty Limited  (ACN 003 252 275  ABN 91 003 252 275)
GPO Box 3411
Sydney NSW      2001
Australia
Fax:     +61:(0)2-8221-9599
E-mail:  phil@pricom.com.au

Re: DHCP & remote ssh logins

[Martijn Lievaart]

Phil Rhoades wrote:
> People,
>
> If iptables are setup to only accept ssh logins from particular IPs, how
> do people login when they are on the move and have a DHCP allocated IP?
>   

Ssh to a known box with a fixed IP address and ssh to the target from there.

> I thought I could do this by sending a mail (from the remote DHCP IP)
> formatted in a particular way, to a particular user on the destination
> server which would then be processed, which would then cause a change to
> the iptables setup.  However, I assume other people have had to solve
> this problem and I don't want to re-invent wheels . .
>   

Google for port knocking.

HTH,
M4