route-map CLEAR-DF permit 10 set ip df 0 ! and under the interface
ip policy route-map CLEAR-DF
Looking at the confign the customer shouldn't receive a mtu of 1433 in any case as we are adjusting it to get max 1322? Also I was wondering if I should use ip virtual-reassembly cmd? Shall i use it on the [router] under the interface feacing the [WIFI controller]?
when using GRE you have to take in to consideration that GRE adds another 24 bytes to a packet and after this increase the packet may need to be fragmented because it is larger then the outbound MTU. Because the packet will be too large for the IP MTU after the GRE overhead (24 bytes) is added, the forwarding router breaks the datagram into two fragments of 1476 (20 bytes IP header + 1456 bytes IP payload) and 44 bytes (20 bytes of IP header + 24 bytes of IP payload) so after the GRE encapsulation is added, the packet will not be larger than the outgoing physical interface MTU.
In you case you could use PMTUD. PMTUD is needed in network situations where intermediate links have smaller MTUs than the MTU of the end links by reduceing the effective MTU of the outgoing interface.
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