Question

How to control as server ports?

Asked by: akohan


Hello group,


I'm not a network specialist and will appreciate it if you could give me some heads up on this:
scenario:

In a network, there are PC1, PC2, ... PCn and also a server as SERV. Please know that all these are connected to the internet via a router as R1.

1) How can I make SERV open only on SMTP port 25 - outgoing emails  and block other accesses to the SERV? but other PCs must be able to have access to internet ?

2) Does having a router will make this hard?



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Asked On
2009-10-26 at 12:38:21ID24844866
Tags

networking

,

internet

,

http

,

windows

Topics

Miscellaneous Networking

,

Windows NT Setup

,

Hypertext Transfer Protocol (HTTP)

Participating Experts
2
Points
500
Comments
2

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Answers

 

by: Spec01Posted on 2009-10-26 at 12:51:14ID: 25666029

If your router has the capability to have multiple DMZ's you can block all the ports except port 25 on the server and have the other computers on the DMZ. Another thing you can do is create a vlan for the server blocking the ports and create a rule that will allow that vlan to talk to the other computers on the network.

 

by: tops1Posted on 2009-10-26 at 13:29:49ID: 25666473

As Spec01 says, it depends on the capability of the router. Altough you say you want outgoing SMTP access from SERV. Most firewalls won't block outgoing traffic unless explicitly set so if you're only interested in sending from the server and not receiving you probably don't have to do anything.

If you're needing access to your server inwards then you might be able to get away with a simple firewall rule saying "allow access from the internet to <<ip of SERV>> on port 25"

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