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ssg20 adsl0/1 set up with two external IP addresses

Posted on 2009-04-21
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Last Modified: 2012-05-06
Hi
We am new to Juniper and we have an SSG-20. We have been trying to setup the ADSL on this system.

We are running a server with Small Business Server 2003 on which includes MS-Exchange, the server has 2 network cards which one is the LAN and the other is for the WAN Access, the LAN is using an internal IP address range of 10.0.0.1/24

Our WAN network card on the server is : IP address 81.x.x.62 with a subnet mask of 255.255.255.252 and the default gateway as the SSG-20  (internal) IP address of 10.0.0.70

The adsl 0/1 has an external IP address of 81.x.x.61

Our ISP issued us with 2 ip addresses which on my previous router I could connect to one ip address to the router and the other we could use Remote Desktop Connection to connect to the server.

We have our emails directed to IP address 81.x.x.62 (which is the WAN Network Card address on the server) but currently can not receive email, although I can send them out.

We currently have the LAN and the WAN Network card connect to the SSG-20 in to ethernet ports 0/2 and 0/3 which are assigned to bgroup0

We need a urgent help on this subject as we can not see where we are going wrong.

Many thanks

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Question by:MahargNala
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Sanga Collins earned 1920 total points
ID: 24196184
im not a big fan of using SBS with the dual NIC configuration it forces all network traffic to route through the server which can have mixed results depending on the health and performance of the server itself. Now that you have introduced a juniper into your network you may want to retire the dual NIC configuration.

unless there is a specific reason why you need two nics on the server, this is what you should do.

first disbale the dual NIC config
on the juniper WAN port, configure your ip information from the ISP.(the ip that was connected to your router)
on the juniper LAN port configure the IP address information for you private network (10.0.0.1/24)
plug the switch where your server and all your workstations are connected into the LAN port of the juniper.
on the juniper configure a MIP (mapped IP) to map the second public ip from your ISP to the private IP of your server.
then finally create a policy to allow traffic from the WAN to the configured MIP and allow RDP and SMTP services.

this is a basci overview on how i've done it at serveral of my remote offices. if you need details on any specific step just let us know




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Author Comment

by:MahargNala
ID: 24196225
Hi thanks for the reply, I take it that we need to add the MIP to the adsl0/1 port?
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Assisted Solution

by:deimark
deimark earned 80 total points
ID: 24196297
I echo sangamc here, get rid of the dual NIC on the SBS.

And yes, add the MIP to the ADSL port

Points to note here tho, is the specific policies to be created for the SBS server.

From untrust to trust any src > MIP address smtp/RDP permit log

If you dont specify the MIP as the destination, things will not work
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Expert Comment

by:Sanga Collins
ID: 24196522
deimark again!!!!

i thought i was the only one who likes juniper devices on EE, good to know that there are others.
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Expert Comment

by:deimark
ID: 24196878
Apologies sangamc,didn't mean to steal your thunder. :P  Just trying to help :)

DM
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Author Closing Comment

by:MahargNala
ID: 31572819
Hi Sangamc & Deimark

Thanks for your assitance it worked!

You will see I have allocated the points 480/20 I hope this is acceptable

Thanks again MahargNala
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