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First of all, routers come with static ips... (the default is usually
192.168.1.1). So I am going to assume you mean your internet ip is a
dynamic ip. Now Im not an ISA expert, so I may be wrong... but ISA
should work with a dynamic external IP. And lastly if you cant get it to
work, a quick call to your ISP will get you a static IP.
Try to configure the IP address of the external NIC in the same network as your
router with the default gateway pointing to your router´s IP address.
In the internal NIC, configure the IP address of the internal network
in the same subnet as your internal clients, set no default gateway and
set an internal DNS.
In the internal network definition, you should put only the networks behind ISA trust interface.
Create access rules according to your needs.
If you need more help come back.Post / thumbs / testimonial are welcome!
Hi, UltraSurf is a hard one to block from ISA itself because it uses the local host computer through port 9666 as it’s proxy to intercept browser requests and encrypt them through 443/SSL traffic through your corporate proxy server. UltraSurf uses a network of anonymous proxies like Botnets that can change dynamically at any given time. So how can you successfully block it? Well I don’t know if you can totally but you may be able to deter it a bit. A few ways are: Policy – Do you have an acceptable use policy in-place? If you do then I would think the threat of job loss and termination should be a darn good deterrent. At the local host – Using group policy, restrict access to the local host site in IE. That would be 127.0.0.1 and Ultra1 that it resolves to. If you have the capability, restrict TCP port 9666 on the local host outbound. Setting software restriction in group policy is another to prevent the UltraSoft application from running. On the ISA – Go to http://www.isaserver.bm and download Steve’s blocking anonymous domain sets and configure a deny access rule to help block anonymous proxy access. You won’t totally stop access but the list will defiantly put a damper on accessing the most popular sites. Collective software ClearTunnel is another ISA add-on to help uncover scrupulous activity. http://www.collectivesoftware.com/Products/ClearTunnel Good luck! Save a tree.
DNs (Domain Name System)
DNS is used for resolving mapping between IP addreses and host names.
Means when you quary for yahoo.com computer only recognize bits and bytes format so but dnd resolves this isssue when it got yahoo.com quary it send request to ip addreses of yahoo.com.
If you change dns ip to that then all quary goes to tht dnd server if it has info for your quary then it forwards to there other wise you get page not found.
Assuming that your objective is to have an ISA server to protect each building's separate internet connection while maintaining a separate link for the internal networks between buildings then the answer is yes.
Here are a few things to watch:
1. Each building needs to be on its own subnet
2. You can connect the buildings to each other through ISA in several ways or by using a layer 3 switch or router on each end. Either way, you'll need to provide routes between the two private networks.
3. If you only have on DC and it's handling all DHCP you'll need to make sure that the switches can handle DHCP helpers and configure this appropriately. If you need help on this, let me know.
4. If you want to have the ability to quickly configure one ISA server to handle traffic for the opposite building in the event of an internet failure you'll need to configure a short DHCP lease. That way you can re-configure the gateway and get it out quickly to the clients after a failure, i.e. if you can stand an hour without internet easily, a one hour lease would be appropriate. The price for this is increased DHCP overhead traffic on the network.
If you are looking for a true high availability solution where you'll have no downtime on either side if the internet goes down then you will need ISA Enterprise on each end and the implementation will be quite complex and well beyond the scope of what we can do here.
If any of my assumptions are wrong, let me know and I'll try to fill in the holes.
When a company has a Web monitoring server sites can only be accessed by having the administrator open up access to them. Even using a proxy would not work since traffic first goes through the monitoring server then out to the proxy.
If this is a site you need access to, I'd contact the admin and put in a request for access to the site.
This would need to be configured on whatever system it is that is serving DHCP. Assuming it is the same box as ISA Server, it would then have to be running Microsoft DHCP. In Microsoft's DHCP, you can assign reservations for specific MAC addresses. You need to open the DHCP management console, then expand out the server name. If the server name is not listed, you will need to connect to the server hosting the DHCP service by right clicking on the root node, etc.
Assuming you have a connection to the DHCP server and can see the zone you are referring to (172.16.2.0/23 which contains all addresses in the subnet to which you refer), under the zone, right click on Reservations and choose New Reservation. Enter a name, the specific IP address for that machine and the MAC address. That's all there is to it. Next time that machine requests an address from the DHCP server, it will issue the address you configured. It will not issue it to any other machine.