#!/usr/sbin/nft -f table inet filter { chain input { # imsd's IPsec-protected SIP ports on the IMS PDN. Ordered before # 01_wwan.nft's qmapmux drop: the ESP-decapsulated inbound flows # arrive on qmapmux* and would be dropped there. The comment is # load-bearing — imsd's ims-pdn-up.sh checks for it and skips its # runtime rule insertion when this rule is present. iifname "qmapmux*" tcp dport 45061-45062 accept comment "imsd-protected-ports" iifname "qmapmux*" udp dport 45061-45062 accept comment "imsd-protected-ports" } }