GTP Load Balancer

GTP-LB decodes and proxies both GTP protocol generations' control- plane signalling — Echo, Create PDP Context (v1) and Create Session (v2) — so a network running either generation, or both during a migration, is served by a single instance.

Incoming session-establishment requests are matched against a rules table by IMSI or APN prefix, directing each subscriber's session to its configured destination rather than a single static peer for all traffic.

Once a session is established, GTP-LB caches the TEID pairing and uses it to forward every subsequent message for that tunnel — Update, Delete and other in-session signalling — to the correct peer without re-evaluating the routing rules each time.

GTP-LB rewrites the GSN address (v1) or F-TEID (v2) in signalling responses to point back at itself, so neither the originator nor the destination needs to be aware that traffic is being proxied.