Hi Warren, it will be dificult to find software for this model as this model reached end of life back in 2001, it is no even supported under smartnet.. yes you can find documentation still, but there is no software available.
Sorry but that is not possible, the newer versions do not support the hardware in your 520, which BTW you should be thankful that its still running, its very old, which considering means your network is nto being protected like it should be.
Sounds like a good sales pitch.. i wonder if cisco is hiring :-)
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...