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Assigning Multiple IP on External NIC (ISAS 2004)

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Assigning Multiple IP on External NIC (ISAS 2004) - 21.Mar.2006 12:09:32 AM   
textguru

 

Posts: 223
Joined: 4.May2004
From: Philippines
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Hi!

Is there any advantage of assigning multiple IP Address on ISAS 2004's external NIC?
Post #: 1
RE: Assigning Multiple IP on External NIC (ISAS 2004) - 21.Mar.2006 12:34:44 AM   
elmajdal

 

Posts: 6022
Joined: 16.Sep.2004
From: Lebanese in Kuwait
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as I remember I used multiple IPs with ISA 2000 cuz i needed multiple listeners.

On ISA 2004 you can have multiple listeners with ONE IP Address because the Application layer inspection capabilities.

i dont think there is an impact on the performance by using multiple IPs.

the advantage is by using a different IP for each site you want to publish, but again i say , with isa 2004, u can have multiple listeners with ONE IP.


HTH

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Tarek Majdalani

Windows Expert - IT Pro MVP
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(in reply to textguru)
Post #: 2
RE: Assigning Multiple IP on External NIC (ISAS 2004) - 21.Mar.2006 12:48:10 AM   
textguru

 

Posts: 223
Joined: 4.May2004
From: Philippines
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can you recommend articles on this information? Currently I am using ISAS 2000 Standard on Windows Server 2003 that have multiple IP address.

(in reply to elmajdal)
Post #: 3
RE: Assigning Multiple IP on External NIC (ISAS 2004) - 3.Oct.2006 11:04:07 AM   
ras2a

 

Posts: 15
Joined: 25.Sep.2006
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New to ISA, so go easy.

I have multiple IPs assigned to external NIC of my ISA 2k4 box. I want to be able to 'use' one of these IPs for a machine on my LAN that is running applications with non-standard ports (games etc). Now, can I somehow have 'all traffic' directed through to this by way of one of the spare IPs? How would I achieve this?

Alternatively, is there some rule I can set up that would allow 'all traffic' through to a specific machine on my LAN.  I've been trying to get multiplayer games etc working from behind ISA for weeks and have just about given up.

If you guy's can suggest some alternatives, that would be greatly appreciated!  Maybe I should be using some kind of DMZ config, or is it better to create a new rule/listener for the public ip I want to use and set it as Route instead of NAT...would this work?

Please, can someone help me with this?

Thanks a lot

ras

< Message edited by ras2a -- 3.Oct.2006 11:45:13 AM >

(in reply to textguru)
Post #: 4
RE: Assigning Multiple IP on External NIC (ISAS 2004) - 4.Oct.2006 12:04:00 PM   
ras2a

 

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Joined: 25.Sep.2006
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What I've done for now (quick workaround) is to assign one my spare public IPs to the NIC of my game server and specify the gateway to be my ADSL router (as opposed to ISA).  This totally bypasses ISA and makes this partiicular machine wide open to attack, so, I've installed and enabled Zone Alarm (for now)...I'm gonna then forward necessary ports for whatever apps I require. 

I haven't tested this out fully yet, but the public IP I assigned is fully pingable from external networks.  This is only a temporary measure and I wouldn't dream of leaving the machine 'completely' exposed for long periods (The machine is a gaming rig and seldom turned on) whereas my other machines/servers are on 24/7.

Again, this is a crappy workaround until I decipher just how to get multiplayer gaming behind ISA, working!

(in reply to ras2a)
Post #: 5
RE: Assigning Multiple IP on External NIC (ISAS 2004) - 5.Oct.2006 1:31:28 AM   
H4ppyGilmore

 

Posts: 199
Joined: 8.Apr.2006
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Even though you can have multiple listeners on a single IP number, they all must use different ports except web listeners. 

However, I don't understand why ISA doesn't prevent Someone from creating a rule that conflicts with another rule with the same listener.  You will have to check the event viewer for the reason why your new rule is not working.     

(in reply to ras2a)
Post #: 6

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