Ports required for Various Services/Applications

In addition to those applications described in the /etc/shorewall/rules documentation, here are some other services/applications that you may need to configure your firewall to accommodate.

NTP (Network Time Protocol)

UDP Port 123

rdate

TCP Port 37

UseNet (NNTP)

TCP Port 119

DNS

UDP Port 53. If you are configuring a DNS client, you will probably want to open TCP Port 53 as well.
If you are configuring a server, only open TCP Port 53 if you will return long replies to queries or if you need to enable ZONE transfers. In the latter case, be sure that your server is properly configured.

ICQ   

UDP Port 4000. You will also need to open a range of TCP ports which you can specify to your ICQ client. By default, clients use 4000-4100.

PPTP

Protocol 47 (NOT port 47) and TCP Port 1723 (Lots more information here).

IPSEC

Protocols 50 and 51 (NOT ports 50 and 51) and UDP Port 500. These should be opened in both directions.

SMTP

 TCP Port 25.

POP3

TCP Port 110.

TELNET

TCP Port 23.

SSH

TCP Port 22.

Auth (identd)

TCP Port 113

Web Access

TCP Ports 80 and 443.

FTP

Server configuration is covered on in the /etc/shorewall/rules documentation,

For a client, you must open outbound TCP port 21 and be sure that your kernel is compiled to support FTP connection tracking. If you build this support as a module, Shorewall will automatically load the module from /var/lib/<kernel version>/kernel/net/ipv4/netfilter. 

SMB/NMB (Samba/Windows Browsing/File Sharing)

TCP Ports 137, 139 and 445.
UDP Ports 137-139.

Also, see this page.

Traceroute

UDP ports 33434 through 33434+<max number of hops>-1

NFS

There's some good information at  http://nfs.sourceforge.net/nfs-howto/security.html

Didn't find what you are looking for -- have you looked in your own /etc/services file?

Still looking? Try http://www.networkice.com/advice/Exploits/Ports

Last updated 8/21/2002 - Tom Eastep