I have to implement a VPN connection (PIX to PIX with IPsec) from a branch office to the headquarter. There will be some type of Internet connection (DSL or leased line with public IP's) at branch office. The VPN config is straight forward but the business requirements are that there must exist a ISDN backup directly into the headquarter.
Has anyone any idea how to design that network? My primary problem is the routing of traffic between headquarter and branch. OSPF cannot be used with ISDN and static routes are not changed in case of VPN failure to point to isdn. ISDN backup dial interfaces are although not possible due to different devices.
This solution doesnt meet the security requirements. In this case the router outside the firewall connects directly into the company net over isdn. The ISDN Router must stay behind the PIX in a high security level network segment. A solution could be a router outside the PIX with ISDN dialing into an ISP. The PIX could use can use ISDN or DSL tranparently. But what to do if the Headquarter PIX or Internet connection is down. In this case VPN is although down.
One more question from me: while main line down (VPN via ISDN) the ISDN line is allways UP, unregarding of no-interesting traffic to send trough the VPN (for example: branch office closed for week-end).
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...