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FS#2474 - ping: When IPv6-in-IPv4 tunnel interface is specified as a source, link local IPv6 address is used #8470

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openwrt-bot opened this issue Aug 29, 2019 · 0 comments
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ashway83:

Environment: OpenWrt 18.06.4 r7808-ef686b7292 / LuCI openwrt-18.06 branch (git-19.170.32094-4d6d8bc)

Description:

When IPv6-in-IPv4 tunnel interface is specified as a source interface, link local IPv6 address is used instead of a public IPv6 address.

root@OpenWRT:~# ifconfig
6in4-wan6 Link encap:IPv6-in-IPv4
inet6 addr: fe80::xxxx:xxxx/64 Scope:Link
inet6 addr: 2001:xxx:xx:xxx::2/64 Scope:Global
UP POINTOPOINT RUNNING NOARP MTU:1280 Metric:1
RX packets:2551 errors:0 dropped:0 overruns:0 frame:0
TX packets:3885 errors:0 dropped:689 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:217476 (212.3 KiB) TX bytes:525551 (513.2 KiB)

ICMP request are sent with a link local address set as a source:

root@OpenWRT:~# ping -I 6in4-wan6 -c 3 2001:4860:4860::8888
PING 2001:4860:4860::8888 (2001:4860:4860::8888): 56 data bytes

--- 2001:4860:4860::8888 ping statistics ---
3 packets transmitted, 0 packets received, 100% packet loss

Expected behavior (public IPv6 address is used as a source address):

root@OpenWRT:~# ping -I 2001:xxx:xx:xxx::2 -c 3 2001:4860:4860::8888
PING 2001:4860:4860::8888 (2001:4860:4860::8888) from 2001:470:70:46b::2: 56 data bytes
64 bytes from 2001:4860:4860::8888: seq=0 ttl=58 time=15.708 ms
64 bytes from 2001:4860:4860::8888: seq=1 ttl=58 time=17.387 ms
64 bytes from 2001:4860:4860::8888: seq=2 ttl=58 time=15.723 ms

--- 2001:4860:4860::8888 ping statistics ---
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max = 15.708/16.272/17.387 ms

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