Have ASA5510 and first thing i like to is to open tracert so please help with entry.
Also our connection is not stable and sometimes connection goes down or some sites don't open up. As you go through the configs you can see it's hard-coded with 1000/full and the router 1841 that attached to this 10/100. Can this be issue that connection is not stable and also can we remove 1000/full coded and set to auto-negotiate.
You would also need to add the following:
access-list 100 permit icmp any any
icmp unreachable rate-limit 50 burst-size 6
inspect icmp error
set connection decrement-ttl
Hope that helps.