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Bug #1655
closed
Redmine webserver: Path MTU Discovery does not work
Status:
Closed
Priority:
Normal
Assignee:
-
Category:
-
Start date:
06/09/2014
Due date:
% Done:
0%
Estimated time:
Description
Steps to reproduce:
- connect a laptop to a router; this link has MTU=1396
- use
tcpdumpto capture on the link between router and the outside world; this link has MTU=1500 - on the laptop, run
wget http://redmine.named-data.net/
Expected: HTTP response reaches the laptop
Actual: after sending HTTP request, wget keeps waiting for response
tcpdump capture reveals:
- TCP packets from Redmine webserver are 1416 octets each (including IPv4 header), with "Don't Fragment" flag set
- The router responds ICMP "Fragmentation Needed" message
- Redmine website retransmits TCP packets; those packets are still 1416 octets each with DF flag set
To resolve this bug, either unset DF flag, or configure the firewall and webserver to respond to "Fragmentation Needed" flag correctly
Files
Updated by Junxiao Shi over 11 years ago
This bug appears to be fixed as of Jun 11 09:16 UTC. Please close this issue.
Updated by Anonymous over 11 years ago
- Status changed from New to Closed
named-data was moved to a new server on June 4. Maybe this fixed it? I'll close this issue per Junxiao's report.
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