On a system I control, I have:
# (cd /proc/sys/net/ipv6/conf && grep . {eth*,default,all}/forwarding)
eth0/forwarding:0
eth1/forwarding:1
eth2/forwarding:1
default/forwarding:1
all/forwarding:0
Some of the interfaces forward and some do not. I wish to use radvd
only on some interfaces, and those happen to forward.
But guess what, it still doesn't start! Even removing the initscript
check doesn't help, because the radvd binary itself vomits profusely
at the idea that forwarding is not enabled for _all_ interfaces:
(from strace)
open("/proc/sys/net/ipv6/conf/all/forwarding", O_RDONLY) = 5
fstat64(5, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
<redacted>
read(5, "0\n"..., 1024) = 2
close(5) = 0
[...]
(stderr output)
[Sep 17 17:41:37] radvd: IPv6 forwarding seems to be disabled, exiting
---> Drake Wilson
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