We have an Cisco 1841 router with an external ip of 142.176.xxx.xxx.
Internally all our guests are given an IP via the 1841's built in DHCP server in the 192.168.100.0 range.
A client wants to use a VPN with IPSec with an authenitcation header. Is it not possible because the 1841 is setup as a NAT device?
My understanding is the nat device (1841) changes the header info and because of this change the receiving VPN server discards the packet because it's been altered. Is this correct? Is there any way around it?