gsmtap sinks for local addresses != 127.0.0.1
Using different gsmtap ips is useful to distinguish traffic from multiple sources (just like for the cni components), but the gsmtap check for local addresses fails on linux for example for 127.0.0.x with x > 1 which means no sink is created, which in turn means messages might get swallowed and icmp complaints are being generated.
Linux is happy with 127.0.0.0/8 being used without any additional configuration (as is Windows!), while *BSD would only work with explicitly configured addresses.
Default linux routes:
#ip route show table local broadcast 127.0.0.0 dev lo proto kernel scope link src 127.0.0.1 local 127.0.0.0/8 dev lo proto kernel scope host src 127.0.0.1 local 127.0.0.1 dev lo proto kernel scope host src 127.0.0.1