What is the commands to enable flows between diffirent IP's on same interface

Can you please tell me what compression to use for the cisco 2811 at HO and cisco 1721 in branches on the serial wan interfaces??The 2811 has a Channellised E1 connected.The cisco 1721 has a wic2-tAppreciated

here is my show version:Cisco PIX Firewall Version 6.2(3)Cisco PIX Device Manager Version 2.1(1)Compiled on Thu 17-Jul-03 08:16 by morleegatekeeper up 8 mins 6 secsHardware: PIX-515E, 64 MB RAM, CPU Pentium II 433 MHzFlash E28F128J3 @ 0x300, 16MBBI...

I need encryption licence for my PIX:Hardware: PIX-515E, 64 MB RAM, CPU Pentium II 433 MHzFlash E28F128J3 @ 0x300, 16MBBIOS Flash AM29F400B @ 0xfffd8000, 32KB0: ethernet0: address is 0017.9514.7be4, irq 101: ethernet1: address is 0017.9514.7be6, ir...