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Groups > comp.os.linux.networking > #3907
| From | "Charles T. Smith" <cts.private.yahoo@gmail.com> |
|---|---|
| Newsgroups | comp.os.linux.networking |
| Subject | Re: ping to non-existent addresses on the local loopback succeed! |
| Date | 2016-11-02 16:32 +0000 |
| Organization | A noiseless patient Spider |
| Message-ID | <nvd4fr$pk3$3@dont-email.me> (permalink) |
| References | <nvd05h$pk3$1@dont-email.me> <27dped-40d.ln1@Telcontar.valinor> <nvd1ar$pk3$2@dont-email.me> <e-6dnWGDcLBFlofFnZ2dnUU78fWdnZ2d@brightview.co.uk> |
On Wed, 02 Nov 2016 15:52:39 +0000, Andy Furniss wrote: > Charles T. Smith wrote: >> On Wed, 02 Nov 2016 16:26:58 +0100, Carlos E.R. wrote: >> >>> On 2016-11-02 16:19, Charles T. Smith wrote: >>>> Can someone explain to me why? >>>> >>>> E.g. >>>> >>>> $ ping 127.0.2.1 PING 127.0.2.1 (127.0.2.1) 56(84) bytes of >>>> data. 64 bytes from 127.0.2.1: icmp_seq=1 ttl=64 time=0.064 ms >>>> ... >>> >>> Works as expected. All 127.*.*.* addresses do exist. >> >> Thank you. >> >> But why? >> >> Where would I look for an explanation of that? >> >> Is there a keyword for that phenomena that I can use to search the >> internet? > > https://en.wikipedia.org/wiki/Localhost > > "The IPv4 loopback addresses are reserved within the IPv4 namespace by > the IETF Special Use IPv4 Addresses standard (RFC 5735).[4] The > reservation can be traced back to the November, 1986 Assigned Numbers > standard (RFC 990), which was issued at a time when the first byte of > the IP address was a signed network number that was the only portion of > the address assigned by the IETF. Reserving its highest possible network > number (127) for loopback testing eventually resulted in the excessive > reservation of 16,777,214 loopback addresses." :-) Okay, that's good to know - it's just a fact of life. Thank you very much!
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ping to non-existent addresses on the local loopback succeed! "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2016-11-02 15:19 +0000
Re: ping to non-existent addresses on the local loopback succeed! "Carlos E.R." <robin_listas@invalid.es> - 2016-11-02 16:26 +0100
Re: ping to non-existent addresses on the local loopback succeed! "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2016-11-02 15:39 +0000
Re: ping to non-existent addresses on the local loopback succeed! Andy Furniss <spam@spam> - 2016-11-02 15:52 +0000
Re: ping to non-existent addresses on the local loopback succeed! "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2016-11-02 16:32 +0000
Re: ping to non-existent addresses on the local loopback succeed! Pascal Hambourg <pascal@plouf.fr.eu.org> - 2016-11-03 07:41 +0100
Re: ping to non-existent addresses on the local loopback succeed! "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2016-11-03 08:51 +0000
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