Recommend a router for handling multiple public IPs

Joe G
Joe G used Ask the Experts™
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I have 4 public IPs from my ISP and their router that they gave me has 4 ports on the back.  I understand how this works, 1 port 1 static IP.  So if I plug in a router I static the router and all pcs/laptops/servers connected would see each other and share that same gateway for the internet.  What I need is a router that could allow me to have devices connected to the internet from the shared public IP xxx.xxx.xxx.023 but my mail server recieve traffic from a differnent IP ( xxx.xxx.xxx.025) to its static internal IP.  I heard something about NAT...

My example - I have a domain running exchange and I'll eventually have a web server.  The both mail and webservers will need to communicate with the domain pc's however I need to have outside connections to make the mail and web services work.  I can't forward port 80 soley to my webserver because of my other PC"s so I need a router that can NAT?? I'm not a cisco engineer my strengths are domains enviroments.  Any help in picking a good router for this would be appreciated.  I'm just starting out I would rather perfer the budget friendly type of router that would accomodate me :)
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Cyclops3590Sr Software Engineer

Commented:
What do you currently have for a firewall/router?  Most of them, even SOHO ones, will support multiple public IPs on an interface though they don't always refer to the technology as the same.  some its multiple IPs, some proxy ARP, virtual IP, etc.  also, if you can let me know what your budget is for a new one just in case what you currently have can't do multiple IPs I can try to do a recommendation.  Also, is support or being new a concern.  Personally if multiple IPs is all you care about then we just need to know how many subnets and inside interfaces you need because personally I would recommend going to eBay to save money if you don't mind going with an older model; in my experience their usually just as good (granted you have no access to updates or official support if anything goes wrong)
Joe GIT personal

Author

Commented:
I have a Linksys 600N and a RVS4000.  I throughly looked through the setting I couldn't find anything.  I did see something from DDWRT site that will allow me to reuse the hardware and get what I want but like you said with the older models it will be hard to get support if anything goes wrong.  I don't need many internal subnet.  Actually right now I can be fine with just 1 so if you have a router in mind let me know and i'll weight my options.  If a new one can cost around $500 i'll be willing but I can be way off the mark... hopefully not :)  

thanks in advance!

Commented:
I have a Draytek Vigor 2820vn, which supports what you're after.

The WAN side supports Aliases for external IPs, which you then assign to the NAT tables. Actually instead of trying to explain any more I've just found this link, which does a far better job of explaining it.
http://www.draytek.co.uk/support/kb_vigor_multinat.html

Mine is about 3 years old, but you can still get hold of them, I paid about £180, but I think they are nearer the £120 mark now. It's been by far the best router I have ever owned. I had a small issue with VoIP initially, but the support were great. The unit has never let me down unlike the various Netgear ones I used to use.

The new version the 2830 looks like it can do so much more than the 2820 and they are @ £160 from broadband buyer in the UK, but I'm sure you could source one closer to home.

Cheers, Mike...
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Joe GIT personal

Author

Commented:
The price is right :) do you have a name or keyword I can use to narrow my search down for what I'm looking for my router to be able to handle?  Thank you for the info Mike.  
Cyclops3590Sr Software Engineer

Commented:
Well it sounds like an old juniper net screen 5gt is good enough for you. It's older but for about $20 on eBay it'll do the trick. I use one at home and it's just fine. Either that or a pix 501 or 506e will work fine as well for about the same price. Also this way it's easier to find people that can help you configure the device than other vendor firewalls.
Joe GIT personal

Author

Commented:
thanks Cyclops any chance you would know the current comparable model for those routers you suggested?
Sr Software Engineer
Commented:
For cisco it's the Asa 5505 which runs about $200 and for juniper it's the ssg5 which run $250. I've worked with all of them (not the draytek mentioned above but the ones I've recommended) and personally I'd go with the the Asa. It gives everything a soho operation needs without too much complexity.
Joe GIT personal

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Commented:
thank you.

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