Static IP Address Binding

iNaNimAtE · Posted: Mon Jun 14, 2004 7:38 pm Post subject: Static IP Address Binding

I was just on the phone with Linksys, and that person did not explain a damn thing. I am hoping that one of you can help clarify.

I am going to order 5 static IP addresses (actually they're free), but I need to get the whole binding thing straight.

Now if 5 IP Addresses are going to the router, how is each computer going to know what IP to use? I heard that lady rambling something about a switch between the router and the modem. Would I have 2 or 3 routers on one switch, and the switch would bind a static IP to each router?

It would be great if someone could clarify how this works with a Linksys router.
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Anonymoose · - Joined: 09 Sep 2003 Posts: 2192

5 IP addresses don't 'go' to the router - you are simply being allocated those IPs to use. It doesn't mean that the router will receive 5 IPs and have to try and decide where to put them.

The router would use 1 IP. You can then either set up a DHCP scope on your router that only allows it to allocate the other 4 IPs, or simply switch off DHCP on your router altogether and set the IP for each machine manually in Windows/Linux. It should be up to you which IP you choose to use for which machine, although the router may still pick one up automatically if you do not set it manually in your router options.

Note that a switch does not allocate IPs, it's just a repeater of the ethernet signal. More intelligent than a hub, but it still does not include a DHCP server...

iNaNimAtE · Posted: Mon Jun 14, 2004 9:02 pm Post subject:

I already don't use the DHCP. All my computers are manually set internal IPs. What I don't get is, how can I go about assigning an external IP to an internal IP? I have a feeling it is static routing, but I am not sure.

And then there is the whole idea about having multiple computers using port 80 (with port forwarding). It doesn't sound like I am capable of doing that, but then I wonder how others do.
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Anonymoose · - Joined: 09 Sep 2003 Posts: 2192

If your ISP is selling blocks of IPs they should have some setup details buried on their site. Basically, you turn off NAT and setup static routes for each IP afaik. What's the full model number for your router ?

iNaNimAtE · Posted: Tue Jun 15, 2004 1:45 am Post subject:

Linksys BEFSR41.
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eugeneotsuka · - Joined: 06 Jul 2004 Posts: 11

CapFusion · Posted: Thu Jul 08, 2004 10:25 pm Post subject:

Having five IP from your ISP is kind of useless. The only time 5 IP is usefull is to have all your LAN PC to use each as static to that IP provided from your ISP. The router simply do not nothing. From each five PC you have, set it all the IP and DNS for each PC. Do not use auto setting. Doing this will limited to five PC that will be able to connect to internet.

If you really want five (5) IP to work for you, you MUST NEED to have a router that will support multi-WAN or using five router and have one PC to do the routing with 5 NIC and have a software to do the IP TEAMING.

Please note, all windows series can only have ONE default gateway.
Also, using the public IP from your ISP is asking for security risk.
And also, you PC are connecting to your ISP directly to their network and not from your router.
Finally, you may have problem connecting all your five PC communicating to each other to share resources.

There are many other method for those 5 public IP. All will be complicated and need extra equipement. Being a Corporation will be feasible but as a home or SOHO, it maybe too much. Having five IP from ISP sound and look nice but that all it is.
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iNaNimAtE · Posted: Mon Jul 12, 2004 4:51 am Post subject:

CapFusion · Posted: Mon Jul 12, 2004 11:14 pm Post subject:

Ok, so it is not useless with 5 IP, in your case.
How are you going to use 5 IP? Does your Router support 5 IP? Do any of your Windows can use 5 IP? Let say you have 5 PC and setup each 5 IP provide by your ISP, which IP will each PC use to get out to WWW from one router? Are you going to use all 5 PC attach directly to your broadband modem / router provided by your ISP?

Without using any router and just using the broadband modem from your ISP with 5 port. Do you have any appliance or some tool to combine those 5 IP? Are you aware of "IP Teaming"?

In short, how will you use all 5 IP?
I do not think "Linksys BEFSR41" will be able to use all 5 IP.

Do you have 5 IP or multiply public IP?
For home user or SOHO user, two IP is enough. One IP will do most of the work and the 2nd IP simply for testing for the first IP.

The use for multi-IP most deal with bigger network like a corporation. They can have separate scope for each division or department. The other use is for redundant, but still use by big network or corporation that have a true enterprise router and DO have this multi-IP support. The alternative low budget company can use IP teaming will complish this same task.

Again, I still do not see the use of 5 public IP for home user.
IP#1 - LAN with 1 or 2 PC or more
IP#2 - LAN with 1 PC
IP#3 - LAN with 1 PC
etc....
Do you have any mean of protection between your ISP / WWW and your PC?
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CapFusion · Posted: Mon Jul 12, 2004 11:35 pm Post subject:

iNaNimAtE · Posted: Tue Jul 13, 2004 12:34 am Post subject:

Such a multi-part question deserves a multi-part answer.

Anonymoose · - Joined: 09 Sep 2003 Posts: 2192

As I said before, turn off NAT on the router, set the IPs for your other PCs either manually or by changing the DHCP scope to only cover those IPs. ARP will sort out the rest...

CapFusion · Posted: Tue Jul 13, 2004 5:36 pm Post subject:

IP teaming does not mean increase speed or connection just because you have more than one IP. Reason for that is - whatever connection speed you and your ISP contracted, it that speed that you purchased.

There no low end router will have multi-IP support. You will be looking at enterprise class router / modem.
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Anonymoose · - Joined: 09 Sep 2003 Posts: 2192

*sigh*

You are looking at turning NAT off and setting static routes. Nothing more. Inanimate isn't asking about IP teaming, just using 5 individual public IPs for his network. It would be a pretty shoddy router that couldn't handle this, since this is exactly what a router is designed for. It certainly won't take an enterprise class one, although whether or not Inanimates router will allow this is another matter.

Here's an example using a Netopia router.

http://www.netopia.com/en-us/support/technotes/hardware/CQG_042.html

Example for Linksys on Bellsouth :

http://bellsouth.netfirms.com/Linksys/bellsouth_5_static_ip_configurat.htm

iNaNimAtE · Posted: Tue Jul 13, 2004 7:34 pm Post subject:

Anonymoose, it seems you have the right idea here. Although they aren't my ISP, the Bellsouth guide looks pretty promising in setting up the correct routing. With a litte necessary tweaking, I can probably get it to work properly.

Thank you for your time.
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CapFusion · Posted: Tue Jul 13, 2004 11:32 pm Post subject:

NAT turn-off or disable and just assign static IP of that ISP provided, then your PC is direct connection to WWW. I do not recommend disable NAT, reason due to security. You pretty much exposing yourself.
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iNaNimAtE · Posted: Wed Jul 14, 2004 12:13 am Post subject:

True, disabling NAT does pose some security risk, however I am going to just have to lock down my machine as well as I can... (I will most likely be running Linux).
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CapFusion · Posted: Wed Jul 14, 2004 5:02 pm Post subject:

Hummm.....
Using Linux may not really help in regarding about security. Linux just have lesser target group compare to Windows [VERY huge group]. You will diffinitely need a good firewall. Or better yet, have some kind of appliance in front before your PC.
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iNaNimAtE · Posted: Thu Jul 15, 2004 1:07 am Post subject:

There are services in Windows (such as NetBIOS) that are better off disabled, because they cause such a security risk. Linux, on the other hand, doesn't have NetBIOS. There are also no viruses for Linux.
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CapFusion · Posted: Thu Jul 15, 2004 1:47 am Post subject:

For linux regarding abot virus. It still there but not as many when compare to Windows series. BUT virus will target Linux.
Linux is not vulnerable either in security.

http://www.linuxsecurity.com/articles/host_security_article-9260.html
http://www.theregister.co.uk/2003/10/06/linux_vs_windows_viruses/
Older version -
http://www.sfu.ca/~siegert/linux-security/msg00082.html

Linux is just a lesser target when compare to Windows.
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MaxxBasher · - Joined: 25 Apr 2004 Posts: 44

iNaNimAtE · Posted: Sun Aug 01, 2004 8:41 am Post subject:

Thank you for that diagram.

Now theoretically, if you have 5 WAN IP addresses, but 6 computers connected to say a switch, what happens to the 6th computer?
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MaxxBasher · - Joined: 25 Apr 2004 Posts: 44

I am not 100% sure but the answer may be to connect a router. At the prices you can get them for these days it would probably be a good option.

iNaNimAtE · Posted: Mon Aug 02, 2004 6:25 am Post subject:

No, I already have a router. I'm just wondering what would happen.
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MaxxBasher · - Joined: 25 Apr 2004 Posts: 44

I am not sure but if you bought another router you could plug it into your current router and it would give you space for more computers to be connected to the internet.

Or I suppose you could use ICS on one of your computers and install a second NIC in it to connect to the last computer with crossover cable.

Just a couple of options

CapFusion · Posted: Mon Aug 02, 2004 5:17 pm Post subject:

For the 6th PC, you can set it to your private IP [LAN].
You can have one of your Public IP router to become DHCP. Or setup one PC for routing. Your 6th PC will need to use one of those five router for gateway to get access for WWW.

The 6 PC connect to a switch on one of those 5 PC, nothing. When I say nothing, it really depend on what the function of that router set to. If it set to NAT [DHCP], then your 6 PC will get an IP [LAN IP]. But if it disable /off, it get nothing.
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