we have vpn corporate network with cisco/1721 and cisco/805 routers over the internet since it is quite old equip, can somebody advice how secure are those tunnels going over internet today?
as i understand, they depends on secret preshared key of certain bit-length with dramatical computational power rising, is there danger that somebody on the net my break the security of those vpn tunnels, either in reading the data, or even injecting something into the stream
so, do i need to worry, or these routers and their vpn settings are still safe?
thnx