Telnet can pass, but Ping doesn't work.

In the past I thought that the Telnet ping must also be a pass-through,

Telnet means that a connection channel is established between the two computers. Theoretically it can be ping-tong.
If you cannot ping the pass, the possible reason is that the other host has turned off ping Echo, or the other's firewall has blocked the packets sent by the ping.

The Tenelt is routed, and if the other party sets a denial of direct ping service, the direct ping is not available. the other machine provides Telnet 23 port service, so it can telnet, but disables the ping function, so you can't ping the other machine. is not forbidden Pingl! Because the protocol for Telnet and Ping is not the same

Telnet can pass, but Ping doesn't work.