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- Transit Gateway maintains a uniform MTU of 8500 across all attachments.
- Packets larger than 8500 arriving at the TGW are silently dropped.
- TGW does not generate FRAG_NEEDED ICMP packets at this time. As a result PMTUD does not work.
- TGW enforces MSS clamping for all TCP SYN and SYN-ACKs passing through it.
- For VPN attachments, MSS is clamped at 1500.
Taking that information into consideration, I would suggest that you conduct your tests. To answer your question, you should be able to transit 8500 byte packets through the system.
answered 4 years ago
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