[FS#224] wrong source IP when logging to remote IPv6 syslog server

[LEDE Bugs]

A new Flyspray task has been opened.  Details are below. 

User who did this - Miha Verlic (fluke) 

Attached to Project - LEDE Project
Summary - wrong source IP when logging to remote IPv6 syslog server
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - Hello,

I'm trying to send log to remote IPv6 syslog server (x:y:z:12::1), but packets received by syslog server are invalid. Instead of public IPv6 address, syslog udp packets are sent with ::1 source IP and therefore ignored by destination server. Logging over IPv4 works ok.

tcpdump log from destination syslog server:
23:34:16.988433 IP6 ::1.38044 > x:y:z:12::1.514: SYSLOG daemon.notice, length: 65

Configuration:

/etc/config/system:
   option log_ip 'x:y:z:12::1'

Device is in the same range as syslog server (x:y:z:12::119/64) and has native IPv6 connectivity. Other services (dropbear, ntp client, snmpd, luci) are running fine over IPv6.

Device is TP-Link WDR3600, running lede reboot-1818-gb81fc29.


More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=224