Bug 29349 - Incorrect ICMP ECHO source address on reply
Incorrect ICMP ECHO source address on reply
Status: CLOSED NOTABUG
Product: Red Hat Linux
Classification: Retired
Component: kernel (Show other bugs)
7.0
i386 Linux
medium Severity medium
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Assigned To: Michael K. Johnson
Brock Organ
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Depends On:
Blocks:
  Show dependency treegraph
 
Reported: 2001-02-25 04:36 EST by John Bass
Modified: 2007-04-18 12:31 EDT (History)
0 users

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Environment:
Last Closed: 2001-02-25 04:36:44 EST
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RHEL 7.3 requirements from Atomic Host:
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Description John Bass 2001-02-25 04:36:41 EST
01:15:58.747749 < Client1.domain.test > Server.domain.test: icmp: echo
request (DF) 
01:15:58.747808 > Server.domain.test > Client1.domain.test: icmp: echo
reply
01:16:13.587872 < Client1.domain.test > Server.domain.test: icmp: echo
request (DF) 
01:16:13.587936 > Server.domain.test > Client1.domain.test: icmp: echo
reply
01:16:16.598712 < Client1.domain.test > Client2.domain.test: icmp: echo
request (DF)
01:16:16.599321 < Client1.domain.test > Client2.domain.test: icmp: echo
request
01:16:16.631662 > Client2.domain.test > Client1.domain.test: icmp: echo
reply
01:16:16.663876 > Client2.domain.test > Client1.domain.test: icmp: echo
reply
01:16:18.579882 > arp who-has Client1.domain.test tell Server.domain.test
(x:xx:xx:xx:xx:xx)
01:16:18.585470 < arp reply Client1.domain.test is-at 0:40:96:30:d5:46
(x:xx:xx:xx:xx:xx)
01:16:22.677906 < Client1.domain.test > Server.domain.test: icmp: echo
request (DF)
01:16:22.677972 > Server.domain.test > Client1.domain.test: icmp: echo
reply

The echo request from Client1 were for some reason replied to with a source
address of another client (Client2) instead of the Server.

I just noticed this debugging the ntpd problem previously reported, so I'm
not sure if it's a kernel or tcpdump problem ... I suspect kernel since
tcp dump didn't have any reason to resolve Client2's IP or name otherwise.
Comment 1 Michael K. Johnson 2001-02-27 19:06:43 EST
I see matching requests, does not look like a bug to me.

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