SVN, which is short for subversion is a code repository tool that is used to manage source code versioning. This tool is available on Linux. You may need to open ports on your firewall in order to to allow users access to this service. In your Linux IPTables you can allow the tcp port
svn 3690/tcp # Subversion
This information can be found on a linux system in the /etc/services file. Just do a search for svn.
To add this to your IPTables do
And add the line
-A RH-Firewall-1-INPUT -p tcp -m tcp --dport 3609 -j ACCEPT
Then to restart iptables and allow your svn port to accept from anywhere do
service iptables restart