are you trying to block the icmp and udp traffic or you want them to be blocked ?
as per your config lines if you bind the same or apply the same on the serial interface it will by default deny/block all the other traffic like tcp etc., leaving except udp,icmp coz of the default deny statement at the end of all the access-lists.
so try to modify the ACLs accordingly ...
find the link which will be useful to harden the security ..
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...