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Posted by Tom Stiller on March 1, 2005, 7:36 am
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> Tom Stiller wrote:
> >
> > > I am using Motorola SBG 900 cable modem for past few months. I
> > > have not been able to use ssh, sftp protocols through this cable
> > > modem. For example, programs like putty, winscp3 on Windows don't
> > > run at all. Same is true o the linux side(no response to ssh,
> > > sftp etc.) Any help/suggestion to get this things work will be
> > > gretaly appreciated.
> >
> > Does the modem contain any sort of firewall? If so, is port 22
> > mapped through the the target computer?
> >
>
> Yes, it has firewall and can be configured manually. I didn't look at
> the advanced set up but in basic set up I set it to medium security
> level. What is meant be 'port 22 mapped through the target computer'?
>
> On this modem there is another option available , called Gateway
> configuration which has an option called 'Port Forwarding'. There are
> some built-in option, like https etc. but no ssh. It has to be set
> manually. I can do that but the only confusion is that it is asking for
> a LAN IP address. Which address should I use?
The default port for SSh traffic is 22 so, in order for traffic from the
internet to "see" your computer, the firewall must permit traffic on
port 22 through. Your modem's gateway configuration allows you to
forward a port (e.g. 22) to one of the machines on your side of the
firewall, specified by its IP address.
I don't know this particular modem, but the general rule for port
forwarding is that the IP address of the target machine must be fixed,
as opposed to assigned by DHCP. If these terms are unfamiliar to you, I
suggest you read through the modem's documentation.
--
Tom Stiller
PGP fingerprint = 5108 DDB2 9761 EDE5 E7E3
7BDA 71ED 6496 99C0 C7CF
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