I do not know how to stop the PING REPLY (ICMP Echo) but wish I could. The old 4.x of Zone Alarm Pro I loved and it stopped everything.
On this PC I had the port 113 trouble.
Run scan on all ports to get info on port 133 and look here. https://www.grc.com/port_113.htm
I think I went into the router and made setting change that blocked it.
Wonder if you can still use the old Zone Alarm Pro 4.x on XP Pro. I ran it for years and did not pay after first year to get updates and I like how I could deal with program rights and block what came in or went out on the computer. They used to be really good but new owners made it go downhill. Then Online Armor was really nice but they made changes too and sold program. I won that program and ran a version for year as the Pro version because it had a bug. Bug was it did not change to the free version after year was up. I later got another free version of the program but after year ran out with new owner Emsisoft Anti-Malware + Firewall was the newer software and XP could not run it.
I hate to lose a great program. But XP Pro my time will come so things will end for this computer.
I would go with another firewall that works with XP hewee and then do a search online "how to stop the PING REPLY (ICMP Echo)."
Not sure if that answers your question though.