PIX and ISA 2004

I have following network configuration at main office: {Internet}=={PIX 515e}==network. Would like to implement ISA2004 after PIX firewall: {Internet}=={PIX 515e}=={ISA2004}==main office network. Our remote offices have VPN conenctions to main office network.
question: what options i have to achive this?
How can i configure PIX to allow traffic and have ISA establishing VPN with remote sites?
How can i configure IP addressing schema at main office to achive that PIX perfroms VPN traffic and route this traffic to ISA?
What would be require IP addressing schema - currently i have following:
remote office 1 192.168.10.x; remote office 2 192.168.30.x - main office 192.168.1.x.
Would following configuration works: remote office (192.168.30.x) == {PIX515e main office} 192.168.1.x ===={NIC1 192.168.1.xISA2004 main office; NIC2 192.168.50.x}==main office network 192.168.50x

Hope this is not to much confusing. Thanks in advance...
Makarije_BGDAsked:
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grbladesCommented:
Hi Makarije_BGD,
Yes what you propose will work.
The only specific thing you need to do is add a static mapping in the NAT table in the PIX to translate one of your external IP address to the IP address of the ISA server. Then you need to permit IP protocol 47 (GRE) and UDP port 1723 which are used by the PPTP type VPN that you will be using.

Let me know if you would like help with the commands on the PIX to acomplish this.
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Makarije_BGDAuthor Commented:
Please let me know the commands.

Thanks
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grbladesCommented:
OK First I will take a couple of assumptions. I'll assume that your external IP address is 200.200.200.200 and your internal address is 192.168.1.1. Just change these to whatever you use. So your basic network config will look as follows:-

ip address outside 200.200.200.200 255.255.255.0
ip address inside 192.168.1.1 255.255.255.0
global (outside) 1 interface
nat (inside) 1 0.0.0.0 0.0.0.0 0 0

! Setup a static translation from external IP 200.200.200.201 to the internal ISA server on 192.168.1.2
static (inside,outside)  200.200.200.201 192.168.1.2 netmask 255.255.255.255 0 0
! Define an access-list to permit incoming VPN traffic
access-list outside_in permit udp any host 200.200.200.201 eq 1723
access-list outside_in permit gre any host 200.200.200.201
! Apply the access-list to the outside interface
access-group outside_in in interface outside

That should basically do it. Be carefull of the access-list as you may already have one and in which case you will just need to append the two lines to your original one.
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