miniupnpd启动早于pppoe认证导致无法监听ipv6地址

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以下为路由器启动后的一段日志，可以看到miniupnpd在pppoe还未完成认证时就已经启动，导致其无法监听ipv6地址
May 6 01:08:23 miniupnpd[445]: version 2.0 starting UPnP-IGD ext if ppp0 BOOTID=1588698503
May 6 01:08:23 miniupnpd[445]: HTTP listening on port 14199
May 6 01:08:23 miniupnpd[445]: no HTTP IPv6 address, disabling IPv6
May 6 01:08:24 kernel: br0: port 3(rax0) entered forwarding state
May 6 01:08:24 kernel: br0: port 2(ra0) entered forwarding state
May 6 01:08:24 kernel: br0: port 1(eth2) entered forwarding state
May 6 01:08:27 pppd[418]: PPP session is 11111 (0x1111)
May 6 01:08:28 pppd[418]: Connected to 11:11:11:11:11:11 via interface eth3
May 6 01:08:28 pppd[418]: Using interface ppp0
May 6 01:08:28 pppd[418]: Connect: ppp0 <--> eth3
May 6 01:08:30 pppd[418]: CHAP authentication succeeded: Authentication success,Welcome!
May 6 01:08:30 pppd[418]: CHAP authentication succeeded
……
May 6 01:08:33 dhcp6c[531]: started
May 6 01:08:33 dhcp6c[531]: unexpected advertise
May 6 01:08:33 dhcp6c[531]: status code for identity association-111111: no addresses
May 6 01:08:33 dhcp6c[531]: add address 240e:1111:1111:1111:1111:1111:1111:1111/60 on br0
May 6 01:08:33 dhcp6c[531]: status code for IA_PD-111111: success

在SSH里手动killall miniupnpd && miniupnpd之后，日志如下：
May 6 01:21:52 miniupnpd[445]: shutting down MiniUPnPd
May 6 01:21:52 miniupnpd[661]: version 2.0 starting UPnP-IGD ext if ppp0 BOOTID=1588699312
May 6 01:21:52 miniupnpd[661]: HTTP listening on port 48552
May 6 01:21:52 miniupnpd[661]: HTTP IPv6 address given to control points : [240e:1111:1111:1111:1111:1111:1111:1111]
可以看到此时才可以正常监听ipv6。