lwIP - A Lightweight TCP/IP stack - Bugs: bug #19580, ICMP TTL is not decremented
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bug #19580: ICMP TTL is not decremented
Submitter: | Jonathan Larmour <jifl> | ||
Submitted: | Thu 12 Apr 2007 01:19:12 AM UTC | ||
Category: | IPv4 | Severity: | 2 - Minor |
Item Group: | Faulty Behaviour | Status: | Fixed |
Privacy: | Public | Assigned to: | jifl |
Open/Closed: | Closed | Planned Release: | None |
lwIP version: | None |
Thu 12 Apr 2007 06:56:24 PM UTC, comment #3: |
Jonathan Larmour <jifl> |
Thu 12 Apr 2007 03:08:21 AM UTC, comment #2: Hmm, yes. After now researching this, I think the reporter got it the wrong way round. In fact we should send out an echo reply with the TTL reset back to default. I guess this is because the return route may be assymetric. The patch is much simpler now.
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Jonathan Larmour <jifl> |
Thu 12 Apr 2007 01:37:33 AM UTC, comment #1: I'm not sure that a host have to decrement ttl. I'm agree for a switch or router. I have experiment on my LAN, and when from my pc, I ping another host (pc/windows), TTL is the same in the ECHO & ECHO REPLY. When I ping my router, the TTL is 128 in ECHO packet, and 64 in ECHO REPLY.
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Frédéric Bernon <fbernon> |
Thu 12 Apr 2007 01:19:12 AM UTC, original submission:
Someone noted on the lwip-users mailing list that the TTL on ICMP ECHO REPLIES is not decremented by 1 compared to the ECHO.
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Jonathan Larmour <jifl> |
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Follow 4 latest changes.
Date | Changed by | Updated Field | Previous Value | => | Replaced by |
---|---|---|---|---|---|
2007-04-12 | jifl | Status | In Progress | Fixed | |
Open/Closed | Open | Closed | |||
2007-04-12 | jifl | Attached File | - | Added lwip.echo.ttl.2.patch.txt, #12469 | |
2007-04-12 | jifl | Attached File | - | Added lwip.echo.ttl.patch.txt, #12467 |
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Corresponding source code
I applied the patch.