SNA access

Both Enterprise Extender and TN3270 allow access to SNA applications over an IPv6 network as well as an IPv4 network. For both protocols, it is possible to simultaneously support connectivity over IPv4 and IPv6 networks. Enterprise Extender uses separate path statements and connection networks for each protocol. By assigning different weights to Transmission Groups that use different network protocols, it is possible to have SNA traffic prefer being routed over the IPv6 network or the IPv4 network. For TN3270, the network protocol used is determined by the remote TN3270 client.

Guideline: For Enterprise Extender and TN3270, use global unicast addresses. Although link-local addresses might work in certain configurations, they are not suitable for use when connecting between partner companies. There are few, if any, IPv6 NAT devices which can perform the necessary mappings between limited scope addresses and globally routable addresses and, given the vast number of globally unique IPv6 addresses available, are not necessary.