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https://issues.apache.org/jira/browse/TS-2530?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13881324#comment-13881324
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Ron Barber commented on TS-2530:
--------------------------------
Specific error message and config (note that the ip_hex_string used in the Via
is 27.123.201.216 [1B7BC9D8] for both servers).
{code}
[Jan 21 08:23:04.579] Server {0x2ac02a2a03a0} DEBUG: (http_transact)
[will_this_request_self_loop] Incoming via: http/1.1
sb-ecid2.ec.tw1.yahoo.com[1B7BC9D8] (YahooTrafficServer) has
(sb-ecid3.ec.tw1.yahoo.com[1B7BC9D8] (YahooTrafficServer))
Ifconfig –a
eth0 Link encap:Ethernet HWaddr 00:50:56:09:32:BA
inet addr:10.236.40.156 Bcast:10.236.41.255 Mask:255.255.254.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:16300220 errors:0 dropped:2719 overruns:0 frame:0
TX packets:12985718 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2521492828 (2.3 GiB) TX bytes:1126967933 (1.0 GiB)
Interrupt:10 Base address:0x8000
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:4352451 errors:0 dropped:0 overruns:0 frame:0
TX packets:4352451 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:541739497 (516.6 MiB) TX bytes:541739497 (516.6 MiB)
lo:0 Link encap:Local Loopback
inet addr:27.123.201.216 Mask:255.255.255.255
UP LOOPBACK RUNNING MTU:16436 Metric:1
{code}
> False positive detected for Multi-Hop cycle when using private IP
> -----------------------------------------------------------------
>
> Key: TS-2530
> URL: https://issues.apache.org/jira/browse/TS-2530
> Project: Traffic Server
> Issue Type: Bug
> Components: Core
> Reporter: Ron Barber
> Attachments: TS-2530.patch
>
>
> With hosts A and B running ATS where both hosts have private IPs (10.0.0.1 &
> 10.0.0.2) AND have a local loopback which have a public IP 27.1.1.1 we are
> getting HTTP/1.1 400 Multi-Hop Cycle Detected when host A forwards a request
> to host B.
> ATS searches the incoming Via header for its own ip address
> (Machine::instance()->ip_hex_string) to determine if the request has been
> forwarded back to itself.
> Cause: ATS is selecting the public IP address of the server to insert in the
> Via header (even if it's not on a routable interface).
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