@apangona also make shure you ain't forced on some horrible #IPv4 / #IPv6 #NAT + #PAT scenarios like #4in6 or #4over6 that may provide additional issues and/or packet size increases.

Such cases do caused high CPU load on #Freifunk routers which had to constantly fragmentate and defragmentate packages due to #MTU mismatches (?between WIFI / LAN & WAN, effectively reducing their bandwith to ~ 16 MBit/s max, as they tunnel all traffic via #OpenVPN...