Hi Ron,
So, this gives way to the following, which may be the best we
can do if we can't probe:
1) When there is operational assurance that path MTU discovery between
the egress, ingress and original source will work correctly, the ingress
handles packets as follows:
- for packets no larger than 1280-ENCAPS, encapsulate and send
without fragmentation
- for packets larger than 1280-ENCAPS but no larger than 1280,
encapsulate and fragment into two approximately equal-length
fragments. (Or, if there is operational assurance that there will
be no links with MTU smaller than 1280+ENCAPS in the path,
encapsulate and send without fragmentation.)
- for packets larger than 1280 but no larger than the tunnel MTU,
encapsulate and send without fragmentation
2) When there is no operational assurance that path MTU discovery
between the egress, ingress and original source will work correctly,
the ingress handles packets as follows:
- for packets no larger than 1280-ENCAPS, encapsulate and send
without fragmentation
- for packets larger than 1280-ENCAPS but no larger than 1500,
encapsulate and fragment into two approximately equal-length
fragments. (Or, if there is operational assurance that there will
be no links with MTU smaller than 1500+ENCAPS in the path,
encapsulate and send without fragmentation.)
- for packets larger than 1500, encapsulate and send without
fragmentation
Thanks - Fred
[email protected]
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