Linux as a proxy server
2

Question

Linux as a proxy server

Zelandakh (MIS)

(OP)

24 Jan 00 09:21

My Linux firewall (don't laugh) has all ports disallowed by default. I hope.

SMTP is allowed through port 25. http is also allowed. I need to allow port 21 temporarily but how?

I'm running Redhat Linux 6.

AndyBo (MIS) · Answer 1 · 2000-01-24 10:49:15

Not so sure about the firewall side of things, but if you want to test exactly what is and isn't vulnerable on the server, download SATAN. (Info from http://www.cerias.purdue.edu/coast/satan.html )

Does a nice vulnerability test against the IP address you specify (including the machine it's installed on) and presents it all in a nice, UF format that you can view in your browser.

HTH.

pmkincaid (MIS) · Answer 2 · 2000-01-24 11:54:24

What firewall are you using? If its ipchains, you can add a entry like so:

ipchains -A input -j ACCEPT -p tcp -d xxx.xxx.xxx.xxx 21

Where xxx.xxx.xxx.xxx is your IP address for the interface you are wanting to connect to.

There are a lot more options you can use also if you want to get really paranoid.

IPChains is the only firewall software I know, so if its ipfwadm, hopefully someone else can help...

Zelandakh (MIS) · Answer 3 · 2000-01-25 04:47:45

It is ipchains, so that is perfect, thanks.

Andy - I had never heard of that product but I will be trying it out today. Many thanks.

AndyBo (MIS) · Answer 4 · 2000-02-02 05:01:43

Zel, you might also want to take a look at SAINT. This is an updated checker based upon the original SATAN, and then improved some. Details at http://www.wwdsi.com/saint/

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Linux as a proxy server
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