this is a (dial-up) cisco software client to concentrator connection
i am pretty sure the problem has to be the telephone lines, the client in question are in a very rural location. the telephone people informed me that the line is about 30 yrs old. they will guarentee voice, but not data. i can (from my laptop) dial up and vpn in as that group and user from another location and run a continuous ping to an internal pc on the central site LAN all day long. but when they dial up (no matter what isp they use) they will lose their connection after maybe 2 hours or so and have to reconnect. i have also upgraded thier modem drivers, slowed down the modem speed, and adjust the mtu size to no avail.
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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...