Bug 6633 - ping's return code is always 0
ping's return code is always 0
Status: CLOSED RAWHIDE
Product: Red Hat Linux
Classification: Retired
Component: netkit-base (Show other bugs)
6.1
i386 Linux
medium Severity medium
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Assigned To: Jeff Johnson
:
: 9296 (view as bug list)
Depends On:
Blocks:
  Show dependency treegraph
 
Reported: 1999-11-01 20:06 EST by eugene
Modified: 2008-05-01 11:37 EDT (History)
2 users (show)

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Fixed In Version:
Doc Type: Bug Fix
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Clone Of:
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Last Closed: 2000-01-27 14:44:23 EST
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RHEL 7.3 requirements from Atomic Host:
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Description eugene 1999-11-01 20:06:28 EST
Even if none of the packets returned, ping still
terminates with 0 error code.
Ex: /bin/ping -c 1 -q 10.1.1.2 (non-existant machine on my
network)
returns 0.
It is a very optimistic ping ;-)

Workaround - get ping from 5.2 (I never tried 6.0)
Comment 1 michael 1999-12-26 14:25:59 EST
Same for me. RH 6.1, netkit-base-0.10-37.

Just a guess, but this could be caused by ping receiving a "destination
host unreachable", and counts the error packet as a reply packet. From
the manpage:
     If ping does not receive any reply packets at all it will exit with code
     1.  On error it exits with code 2. Otherwise it exits with code 0. This
     makes it possible to use the exit code to see if a host is alive or not.
so this is, technically, behaviour as documented, but is not expected (or
useful).

$ ping -v -c 1 10.42.42.55
PING 10.42.42.55 (10.42.42.55) from 10.42.42.1 : 56(84) bytes of data.
From 10.42.42.1: Destination Host Unreachable
Vr HL TOS  Len   ID Flg  off TTL Pro  cks      Src      Dst Data
 4  5  00 5400 56a3   0 0000  40  01 c76e 10.42.42.1  10.42.42.55

--- 10.42.42.55 ping statistics ---
1 packets transmitted, 0 packets received, +1 errors, 100% packet loss
$ echo $?
0
Comment 2 Jeff Johnson 2000-01-27 14:44:59 EST
The ping in iputils-991024-2 returns a non-zero return code if host is
unreachable.
Comment 3 Jeff Johnson 2000-02-10 09:24:59 EST
*** Bug 9296 has been marked as a duplicate of this bug. ***

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