Allowing select IPs access to a single port

Allowing select IPs access to a single port

[security]

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Hello, 

What would be the best way to only open port 3306 to 1 or 2 IPs for remote connection? I was hoping someone could provide an iptable command that would achieve this.

I have tried a few things but I am a newbie and have yet to figure this one out.  Any resources or assistance would be appreciated.

Thanks in advance. 

Doug

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Re: Allowing select IPs access to a single port

[Chris Partsenidis]

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Assining the service your remote hosts are trying to access are on the firewall box and its a service that uses the TCP transport protocol, you could try something like the following:


iptables -A INPUT  -s remoteip -p tcp -d yourfirewallip --dport 3306 -j ACCEPT

If the service is on another pc on the internal network:

iptables -A PREROUTING -t nat -s remoteip -p tcp -d yourfirewallip --dport 3306 -j DNAT --to internalhostip

and in the case your internal service is running on a different port, e.g 4000:

iptables -A PREROUTING -t nat -s remoteip -p tcp -d yourfirewallip --dport 3306 -j DNAT --to internalhostip:4000

Hope this helps. I'll soon be covering IPTables on my website so you can check in a few weeks times, hopefully I'll have it posted by then:
www.Firewall.cx

Cheers,
__________________________
Chris Partsenidis.
Systems Network Administrator
Email: Chris@firewall.cx
http://www.firewall.cx  
__________________________
  ----- Original Message ----- 
  From: security@grossepointe.com 
  To: netfilter@lists.netfilter.org 
  Sent: Sunday, February 09, 2003 1:12 AM
  Subject: Allowing select IPs access to a single port 


  Hello, 

  What would be the best way to only open port 3306 to 1 or 2 IPs for remote connection? I was hoping someone could provide an iptable command that would achieve this.

  I have tried a few things but I am a newbie and have yet to figure this one out.  Any resources or assistance would be appreciated.

  Thanks in advance. 

  Doug


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