Hi all,
Wondering if any of you have any details to share about ICMP type 3 code 4 messages, with respect to general internet connections. We don't receive them on either of our internet circuits (BT / CenturyLink) testing via a BT home internet service in the UK, MTU 1492. As such, packets are sent a few bytes too big, so the initial packets are dropped along the path and we can't set up the connection. Disabling setting the DF bit resolves the issue, but not sure i like that solution or if it would be recommended (UDP DTLS tunnel).
Why am i not seeing these ICMP type 3 code 4? Do ISP's routinely drop these? (I have a ticket open with the ISP but so far getting an answer is like pulling teeth. Other Type 3 (net unreachable/port unreachable) are received. I even tried generating my own from a packet generator but they didn't make it there either but not sure if they may be dropped for other reasons.
Cheers,
Daniel
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