does permit udp any eq isakmp = port 500?

[hfakoor222]

permit udp any eq isakmp eq isakmp

does this equal the port 500 of isakmp,  or does it equal the port isakmp is defined on?

same with this one

permit udp any eq ntp any

is this port 123, or is it the ntp port of the destination router

I am assuming it is port 123

[MHM Cisco World]

...

[MHM Cisco World · Accepted solution]

https://datatracker.ietf.org/doc/html/rfc1700

check RFC 1700 for UPD/TCP port for app using in ACL.

for these default APP the UDP/TCP port is known by default and can not change.

https://datatracker.ietf.org/doc/html/rfc2408