Chaos

Blocked ports

Posted by: Samiuela LV Taufa on July 07, 2008 3:10:25 AM

I’ve been playing around with a server at home, and of course the two simplest things to install, configure for testing are:

a mail server
a web server.

I didn’t know that these were blocked from the outside, and since I was only playing around it didn’t bother me much at the time that:

my email messages to the server weren’t getting through, and
I couldn’t connect to my fancy web pages from work

But, thanks to whirlpool, and a few hints from workmates, I am a much better informed consumer.

Blocked Ports

The following ports are blocked on OptusNet:
Inbound
• TCP 25 (SMTP)
• TCP 80 (HTTP)
• TCP/UDP 135 (RPC)
• TCP/UDP 137–139 (NetBIOS)
• TCP/UDP 161–162 (SNMP)
• TCP/UDP 445 (RPC)
• TCP 593 (DCOM)
• TCP 1080 (Socks)
Outbound
• TCP 25 (SMTP — can be disabled at https://memberservices.o...om.au/mailfilter)
Static IPs
This list of blocked ports only applies to Internet connections with a dynamic IP. This includes all cable connections, and all residential dial and DSL connections. If you are on a Small Business DSL or dial plan you can ring Small Business customer service to request a static IP. The ports will be unblocked once your connection has switched over to the new IP.
IPv6 Traffic
Since (currently) most IPv6 traffic travels over a standard IPv4 connection to a tunnel broker, ALL IPv6 ports are unfiltered and unblocked. This should be consistent with all ISPs, not just Optusnet specific.