Standard vpn-tunnels and GRE over IPSEC will encompass differences in the available path-MTU. In this screenshot I will demo a simplest impact that these two tunnel encapsulation can makes over a basic 1500 byte path-MTU
1436 vrs 1400 bytes over ruffly speaking 5% reduction the standard ethernet 1500 bytes MTU.
So any tcp based application that has no means for detecting PMTU can be greatly impacted.
NSE ( network security expert) and Route/Switching Engineer
kfelix -----a----t---- socpuppets ---dot---com
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