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Question : Problem: VPN frame size
We have two sites connected over the internet , with an IPSEC vpn. There are ASAs on either side. The mtu has been hardcoded to 1500.
Is this bad? How much header size does IPSEC add to an ethernet frame? If regular ethernet frames are around 1518, what size are they after ipsec encapsulation?
thanks
Answer : Problem: VPN frame size
The best thing I've found is to adjust the maximum segment size to about 1350. It's a trade-off of slightly higher overhead, but much less work to find the "perfect" value.
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