On Wed, 24 Jun 1998, Nathan Damianos wrote:
|o| Hi everyone. I hope you can take a couple of minutes
|o| of your time to read this and help me out if you can.
|o| We are currently trying to maintain a server of ours in
|o| Norway over the internet but are having a few problems.
|o| Our network setup is a s follows:
|o|
|o| 1.1.1.1 ______ 2.2.2.2 _____|-----|_______3.3.3.3_______4.4.4.4
|o| Sco Unix Linux |____| Firewall Sco Unix
|o| Firewall Internet
|o|
|o|
|o| IP Masquerading occurs at 2.2.2.2. This becomes the address that is
|o| sent over the internet to the firewall at the other end.
|o| It is working with telnet and ftp, but not with rcp (unix remote
|o| file copy command) or rlogin. All the ports on 3.3.3.3 are open to
|o| ip 2.2.2.2, and I'm told all the ports on 2.2.2.2 are open to 1.1.1.1.
|o| Interestingly, I can rcp and rlogin from 2.2.2.2 to 4.4.4.4, and also
|o| from 1.1.1.1 to 2.2.2.2. But when I try to rcp from 1.1.1.1
|o| to 4.4.4.4 I get a response:
|o| 4.4.4.4: Address already in use.
|o|
Natan, this is an easy one (at least, so I think) :-)) When
your rcp packet (coming from 1.1.1.1 with a port number < 1024) gets
masqueraded at 2.2.2.2, it receives the 2.2.2.2 IP address AND A PORT
number > 61000. Thus, as far as 4.4.4.4 is concerned, the rcp request
comes from an UNPRIVILEGED port and is NOT honored.
The work around? I dont't know :-((( I've never been thru this
issue. Perhaps someone else can further help you. Regards ...
...
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