Multiple Public IP support

[insipid2]

I am switching from DSL to a cable broadband connection, and need to get a router that supports multiple public IP addresses.
Before the phone company took care of this, but know the cable company is asking us to buy a 800.00 dollar router, and I would like to buy one on my own used, but have no idea which one to buy. We are not pushing data center level data, just a little book shop with the need for two Public IP addresses.

Any input great appreciated.


Thanks,

Neil

 

[ADB100]

Any Cisco router that supports NAT will work.....

Normally a DSL router (using PPPoA) will be configured to negotiate the IP address via IPCP, but if you pay for a static IP address this will always be the same. If you have multiple IP addresses assigned to you by your ISP then you can simply NAT each inside device to each of the outside Public IP addresses you have:

interface Ethernet0
ip address 10.1.1.254 255.255.255.0
ip nat inside
!
interface dialer1
ip address negotiated (usual config)
ip nat outside
!other stuff here like PPP authentication and ACL's etc
!
ip nat inside source static ip 10.1.1.10 x.x.x.x (1st public IP)
ip nat inside source static ip 10.1.1.11 x.x.x.y (2nd public IP)
ip nat inside source static ip 10.1.1.12 x.x.x.z (3rd public IP)


I would be careful configuring it like this though as without ACL's each of the inside hosts would be directly accessible on the Internet at the IP layer, so any incoming UDP/TCP connections will be allowed. Normally you would NAT at the Transport Layer for specific protocols such as HTTP and SMTP:

ip nat inside source static tcp 10.1.1.10 80 x.x.x.x 80
ip nat inside source static tcp 10.1.1.11 25 x.x.x.y 25


HTH

Andy

 

[plshlpme]

any router with two ethernet ports will be fine...
bottom of the line a 2514 will do it but you can probably get something newer.. say a 2611 at a pretty reasonable cost.

even an old 4000 series if it has ethernet modules in it can be found on the cheap these days...

lots of options

 

[insipid2]

Thanks all.

So if I understand this right, I will need a Ehternet port on the back of the router for each public IP address, or is a single ethernet port capable of managing a multitude of public IP addresses?

Thanks and Happy New Years to all.

Neil

 

[ADB100]

One inside interface (Ethernet) can handle as many hosts as you want, and one outside interface - could be another Ethernet or ADSL etc depending on the presentation from your ISP.

HTH

Andy

 

[JOAMON]

You could do OK with a Cisco 831 Broadband router. Can get used for about $200.00.

 

[JOAMON]

Following would be a good unit as well:

http://cgi.ebay.com/New-CISCO-871W-...ryZ67249QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

See Specs from Cisco:

http://www.cisco.com/en/US/products/hw/routers/ps380/products_data_sheet0900aecd8028a976.html

 

[insipid2]

Thanks to all.
Happy New Years and Peace to all.

Neil