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Twamp light and Udp-small-servers

Greetings everyone!

We are trying to launch twamp light on the remote device connecting to ASR9k.

ASR9k has such configuration:

service ipv4 udp-small-servers max-servers no-limit TWAMP_REFLECTOR

ipv4 access-list TWAMP_REFLECTOR

10 permit ipv4 host 10.63.9.4 host 10.63.9.1

20 deny ipv4 any any

Remote device's source address is 10.63.9.4, destination address - 10.63.9.1 and destination port - 7. Pcap trace shows that ASR responding to remote device with ICMP port unreachable message.

ASR interface does not have any ACL configured.

What could be the reason?

Thank You.

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