> The possible side-effect of performing fragmentation on UDP encapsulated > packets is to worsen the reassembly burden on tunnel egress since fragments > of UDP encapsulated packets are more likely to be forwarded across different > paths towards the tunnel egress than those of IP or GRE encapsulated packets. >
Xiaohu, I don't understand why UDP encapsulation would make things worse than other encapsulations. Fragmentation would be needed at tunnel ingress when packet size exceeds MTU of the tunnel. RFC4459 describes the issues and general solutions that apply to the different techniques of IP tunneling. > It seems that most X-over-UDP proposals choose to prohibit the tunnel ingress > from performing fragmentation on UDP encapsulated packets. See the following > quoted text regarding fragmentation from those X-over-UDP drafts: > Please look a draft-herbert-gue-fragmentation-02. This is a method where the fragmentation/reassembly is performed in the encapsulation layer instead of (outer or inner) IP layer. Tom _______________________________________________ Softwires mailing list [email protected] https://www.ietf.org/mailman/listinfo/softwires
