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Setting up an FTP Server - Part 5

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Router Configuration


You will know need to change your router settings to allow destination ports to be forwarded correctly.

Example

Say a server is behind a firewall, and has an IP address 192.168.0.10. The outside world accesses the server by using, for example, address 243.56.78.1. To make passive mode work, enter '243.56.78.1' as the IP to use for passive mode for the domain.

The above assumes the firewall is set up to pass all the needed packets on to the server. In particular, this means the firewall has to allow incoming TCP connections to port 21 on the server, allow outgoing TCP connections from port 20 (for regular mode data transfers), and allow incoming TCP connections to any random port between 1024 and 65535 on the server (for passive mode transfers). Depending on what the firewall allows to pass it may be that despite passive mode address translation it is still not possible to use passive mode for data transfers.

If the firewall is blocking incoming connections to ports between 1024 and 65535 not all is lost yet. You may be able to open up the firewall to pass a limited range of ports to be used for passive mode data transfers. The Advanced tab in the Server Settings is used to accomplish this.

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The instructions will vary with different routers, but for the Solwise SAR110 and SAR130, the following 2 rules should work.

NAT Rule Information
Rule ID: 30
Rule Flavor: RDR
IF Name: ppp-0
Protocol: TCP
Local Address From: 192.x.x.x
Local Address To: 192.x.x.x
Global Address From: 0.0.0.0
Global Address To: 0.0.0.0
Destination Port From: 21
Destination Port To: 21
Local Port: 21

NAT Rule Information
Rule ID: 20
Rule Flavor: RDR
IF Name: ppp-0
Protocol: TCP
Local Address From: 192.x.x.x
Local Address To: 192.x.x.x
Global Address From: 0.0.0.0
Global Address To: 0.0.0.0
Destination Port From: 52000
Destination Port To: 52010
Local Port: 0

 

 
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