2 WAN, 2 routers, 1 LAN, 1 exchange

ldohos
ldohos used Ask the Experts™
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dear experts,

i need a 'lil help to think over what steps to be done and watched out when i implement the following system.

we do not want to  purchase a dual-wan router (anyway we do have one already but with slow transfer speed) so I would like to solve this with two existing routers using each WAN and LAN  ports routed on the same LAN, where we have one file/exchange server.

WAN1 = cable line with 120 Mbs speed, would serve users, ftp server, everything but exchange server

WAN2 = ADSL, 5 Mbs, should serve exchange server only

This LAN has one small business 2003 with running exchange on it. About 10 users connected , all of them using outlook connected to exchange, all of them wants to be able brows the 120 MBs WAN.
The serer pc it has two gigabit LAn adapters, anyway.

is there any trick with default gateways and DNS  ?

thank you
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Commented:
Since it's an SBS server you are a little stuck.
You can only have a single gateway configured.

Why do you want the 2 connections? Is it not possible to use the 120MB connection for Exchange as well?
Don't see you being stuck here at all.

Configure the server gateway for WAN2. This will mean that external DNS lookups and any other WAN access on the server will be through WAN2.

However, in the DHCP configuration on the server, set it to give out automatic gateway configuration for WAN1. This will mean anyone with a DHCP address will automatically use WAN1 to go out to the web.

That is the quick and easy method of getting it working but should be fine. Can you give me some more details about any other services you might be using on the SBS server? Also, what hardware is it running on?
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Commented:
How will that work?

DNS lookups will be performed on WAN2 which is not what was requested.
Also because clients will be using the SBS server for DNS then they will also perform lookups over WAN2 but will then go out over the internet on WAN1

It's not as simple as it seems.
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Hi demazter...Like I mentioned in my post - yes DNS will be over WAN2, but without more information I cant give a better answer.

And it does actually tick all the boxes apart from DNS.
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Commented:
And all the internet connectivity from the server will also go down WAN2 so WSUS downloads etc etc

As I said, it's not as straight forward as it looks
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Commented:
Also what will happen with FTP? Which I am presuming is to the server itself?
You will come down WAN1 to get FTP access to the server and then because the gateway of the server is WAN2 the FTP connection will fail.

Author

Commented:
hi all, thanks for arguing !
 this is helpful and really the thing i wanted to trigger.

here are some more info.

the serer / exchange is on 192.168.1.10
separate FTP serer (NAS like) is on 192.168.1.20


serer handles DHCP,and DNS, as well


Awarded 2009
Top Expert 2010

Commented:
Is there a reason for the seperation?

Author

Commented:
yes, the 120 Mbs line what was already there can not hae fixed ip due to the isp.

we had to go for a separate line with fixed ip. it has "arrived".

bit this fixed ip-ed adsl can not be fast as the cable one :-)

other reason is the redundancy. if one line goes down, still have another.


the 120 Mbs cable line is capable for mailing as it is now but only with dyndns, and sooner or later some mails will be rejected)


if no safe way to set it up, i have to convince co. owner to buy a new (fast) dual wan router.

Author

Commented:
any more suggestions?
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Top Expert 2010

Commented:
Sorry no, I think the DUAL WAN Router is your best option, for the reasons I have already covered in my previous posts.
Commented:
I think PBR is needed (route map) for the exchage server, put the access list for 1 host only, exchange server

Author

Commented:
i am starting to believe that any "2 router option" would contain too much  trouble and risk and really does not seem errorless / stable solution.

lets go for the dual wan option (since i am really far from understanding and deploying PBRs)

thank you for your efforts

Commented:
what is the current topology of those WANs, users and the mail server sits? can you post it? So we can see whether it needs PBR or not. Are the users and the mail server on the same VLAN?
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Commented:
Personally I think the 2 WAN router option is by far the easiest option

Author

Commented:
thank you

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