ICMP6 Filtering Considerations for eduroam

The following ICMP6 types must be allowed for PMTU

• Destination Unreachable (Type 1) - All codes
• Packet Too Big (Type 2)
• Time Exceeded (Type 3) - Code 0 only
• Parameter Problem (Type 4) - Codes 1 and 2 only

See section 4.3 http://www.ietf.org/rfc/rfc4890.txt