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draft-vaarala-mip4-fragmtu-00 (1) Problem Large packets sometimes dropped by routers If DF=0, may still be dropped If DF=1, MIP suffers from ICMP black holes Realistic deployment issue E.g. one ADSL box silently drops packets > 1360 (if DF=0) RRQ/RRP goes through but some traffic is blackholed! RFC 3519 => fragment before encapsulation, avoids fragments (good), but what is a good MTU? Some implementations have built-in restrictions like 1300 octets => no configurability for administrator This issue could be avoided by (a) robust discovery of MTU, or (b) configurable, negotiated MTU |