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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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