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I wonder if it is possible to use ping command behind a proxy? I'm really confused because this page says: how does ping work over proxy? that it is not possible to use ping command behind proxy.

but this page says can not ping google using proxy it is possible.

which one is correct? I also must mention that curl and wget work correctly but ping doesn't work at all. I also have to add that the only way that I can access to internet is through proxy. is there setting in squid to let the ICMP pass through

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    Did you try httping mentioned in an answer in your second link? Ping itself uses another IP protocol (not TCP) and will not work through a proxy, even a socks proxy.
    – FedKad
    Apr 6, 2021 at 18:52
  • @FedonKadifeli no i didn’t. the point is that there are other servers can ping correctly and they use this proxy server too.
    – SeAlGhz
    Apr 6, 2021 at 19:24

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No, Squid will not proxy ICMP traffic. If the network you are on prohibits ICMP, then you will need to ssh to some other machine that is permitted to send/receive ICMP traffic.

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  • could you please give me a reference ?
    – SeAlGhz
    Apr 7, 2021 at 6:34
  • From the Squid docs (squid-cache.org/Intro): Squid is a fully-featured HTTP/1.0 proxy which is almost (but not quite - we're getting there!) a fully-featured HTTP/1.1 proxy. Squid offers a rich access control, authorization and logging environment to develop web proxy and content serving applications. Squid offers a rich set of traffic optimization options, most of which are enabled by default for simpler installation and high performance. ... Squid is an HTTP proxy, while ICMP is at a lower level of the protocol stack.
    – Matt Causey
    Apr 7, 2021 at 15:30

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