I have Microsoft Exchange 2000 Server (based on MS Windows 2000 Server and running behind MS ISA 2000 Server) connected to two routers.
One of them is a Cisco 1751-V model with Serial WIC used for Internet Access and VoIP. This internet access service is PPP WAN connection based, and has fixed external IP's.
Because we had QoS problems using VoIP over Internet, we decided to put another cheap Zyxel router-switch connected to ADSL Internet Service with dynamic IP's.
I have put both routers in the same subnet. The 1751-V has "x.y.z.209" and the ADSL has "x.y.z.219" IP LAN address.
So well, at first I had problems because the MS ISA Server (Web Proxy and Firewall) only recognise one default gateway. I choose to put as default gateway the "x.y.x.219" and everything goes well (web browsing, e-mail outgoing, vpn service, the web site) - except for ingoing mail.
The mail's simply don't enter when I use the x.y.z.219 default gateway on the server. When I put x.y.z.209 as default gateway everithing goes great, but there is a degradation of VoIP services as it runs from 209 IP.
I would like to discuss if someone knows how to redirect the ingoing mail from the Cisco 1751-V router to the server's external IP (x.y.z.212), without the need of default gateway for that PC.
An important information is that there is response to the command "ping x.y.z.212" (my server) from the Internet.
The ingoing e-mail traffic will not pass through the Non-Cisco gateway since it has a dynamically assigned address, and the SRV DNS record will point towards the 1751 address. As for the VoIP degradation, you can use the "ip rtp priority" to increase the priority for the voice traffic on the Cisco router.
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