NAT Overload and load sharing
I have a Cisco 2650 with IOS 12.3 (c2600-i-mz.123-16.bin), a fast ethernet, and 2 Int T1 CSU/DSU cards.
Verizon has just enabled the second T-1 line for constant operation--it was previosly just a backup line.
Each T-1 is using frame relay on a serial sub-interface and has ip addresses assigned-- using a /30 subnet. The FA0/0 is defined as ip nat inside and the Serial Sub Interfaces are designated as ip nat outside.
I was using" ip nat inside source list 10 interface s0/0.1 overload" to allow internal users access to the Internet.
I can now use the ip nat pool test netmask 255.255.255.252 address 100.100.100.1 100.100.100.1----ip address s0/0.1 address 100.100.100.5 100.100.100.5 ip address s0/1.1
and
ip nat inside source list 10 pool test overload..
This works but I only get T-1 speed inbound--one or the other serial interfaces-no load sharing. Outbound traffic is equally distributed (I have load-sharing per-packet on each serial sub-interface).
Do I have to get Verizon to bond the T-1 lines or can I use NAT on a stick with some route map magic?
Has anyone setup overload nat to load balance incoming traffic? Not incoming traffic to a server.
It looks as though an internal user will get a global address from the pool, which seems to be the same ip address of the same serial interface and subsequently only goes out a single t-1 circuit.
TIA
Digital Doug
read more and respond »Posted 5 years ago by Houston SBC in Cisco Systems
