pppoe拨号方式上网，ubunut服务器需要有pppoe-server也要有dhcpv6-server，路由器端需要ppp-client，也要odhcp6c指向pppoe-wan端口。
pppoe拨号为wan上面的另一种方式，所以需要将uci里面的上网模式proto 改成pppoe
config interface 'wan' option ipv6 '1' option def_ifname 'eth1' option ifname 'eth1' option macaddr 'DC:4B:DD:1d:fa:49' option web_proto 'pppoe' option proto 'pppoe' option pppoe_username 'WkhPTUVfRkE0OF81Rw==' option username 'ZHOME_FA48_5G' option pppoe_password 'MTIzNDU2Nzg=' option password '12345678' option pppoe_peerdns '1' option peerdns '1' option pppoe_advance '0' option sdial '0' config interface 'wan6' option ifname @wan option proto 'dhcpv6'类似上面的pppoe拨号的启动脚本也在./lib/netifd/proto/ppp.sh脚本里面的ppp_generic_setup函数
proto_run_command "$config" /usr/sbin/pppd \ nodetach ipparam "$config" \ ifname "$pppname" \ ${localip:+$localip:} \ ${lcp_failure:+lcp-echo-interval $lcp_interval lcp-echo-failure $lcp_failure $lcp_adap ${ipv6:++ipv6} \ ${autoipv6:+set AUTOIPV6=1} \ ${ip6table:+set IP6TABLE=$ip6table} \ ${peerdns:+set PEERDNS=$peerdns} \ nodefaultroute \ usepeerdns \ $demand $persist maxfail $maxfail \ ${holdoff:+holdoff "$holdoff"} \ ${username:+user "$username" password "$password"} \ ${connect:+connect "$connect"} \ ${disconnect:+disconnect "$disconnect"} \ ip-up-script /lib/netifd/ppp-up \ ipv6-up-script /lib/netifd/ppp6-up \ ip-down-script /lib/netifd/ppp-down \ ipv6-down-script /lib/netifd/ppp-down \ ${mtu:+mtu $mtu mru $mtu} \ "$@" $pppd_optionspppoe的uci在官网可以看到: https://openwrt.org/docs/guide-user/network/wan/wan_interface_protocols
NameTypeRequiredDescriptiondevicefile pathyesModem device nodeusernamestringno(?)Username for PAP/CHAP authenticationpasswordstringno(?)Password for PAP/CHAP authenticationconnectfile pathnoPath to custom PPP connect scriptdisconnectfile pathnoPath to custom PPP disconnect scriptkeepalivenumbernoNumber of unanswered echo requests before consideringpeerdnsbooleannoUse peer-assigned DNS server(s)dnslist of ip addressesnoOverride peer-assigned DNS server(s)ipv6[0,1,auto]no autoEnable IPv6 on the PPP link 0: IPv6 disabled 1: IPv6 enabled auto:pppd_optionsstringnoAdditional command line arguments to pass to the pppd daemon刚开始只会有ppp的进程：
root@zihome:/# ps | grep ppp 32025 root 1720 S /usr/sbin/pppd nodetach ipparam wan ifname pppoe-wan +ipv6 set PEERDNS=1 nodefaultroute usepeerdns maxfail 1 user ubuntu password pppoe ip-up-script /lib/netifd/等到pppoe-wan起来之后，才会自动启动odhcp6c进程
root@zihome:/# ps | grep ppp 32025 root 1720 S /usr/sbin/pppd nodetach ipparam wan ifname pppoe-wan +ipv6 set PEERDNS=1 nodefaultroute usepeerdns maxfail 1 user ubuntu password pppoe ip-up-script /lib/netifd/ 32067 root 844 S odhcp6c -s /lib/netifd/dhcpv6.script -P0 -t120 pppoe-wanubuntu上面启动pppoe-server，sudo pppoe-server -I eth0 -L 100.0.0.1 -R 100.0.0.100 -N 20，服务器IP为100.0.0.1，起始地址为从100.0.0.100开始分配。
这时候路由器设置成pppoe模式拨号，这时候路由器端的pppd进程会发送``PPP IPV6`消息去请求IP地址，请求成功之后，在ubuntu上面会出现一个ppp0的接口，路由器上面会生成一个pppoe-wan的接口。ubuntu的IP为100.0.0.1，路由器的IP为100.0.0.100
因为pppoe-wan端口没有MAC地址，所以没办法自己根据EUI规则生成一个本地地址，当pppoe添加了ipv6的选项之后
pppoe-server会发送PPP IPV6CP的REQUEST数据包，里面附带一个它要生成的本地链路IPV6地址，询问P-T-P的对方路由器我是否可以用这个地址，路由器会返回一个PPP IPV6CP的ACK包，这时候pppoe-server的ppp0端口就会生成一个本地链路IPV6地址fe80::70b2:2149:2eea:8daf同样的路由器也会发送PPP IPV6CP的REQUEST数据包，里面附带一个它要生成的本地链路IPV6地址，询问P-T-P的对方pppoe-server我是否可以用这个地址，pppoe-server会返回一个PPP IPV6CP的ACK包，这时候路由器的pppoe-wan端口就会生成一个本地链路IPV6地址fe80::14ec:b7:dc40:32f6ubuntu上面会出现一个ppp0的端口，路由器可以正常ping 100.0.0.100
linye@linye-ubuntu:~$ ifconfig ppp0 ppp0 Link encap:Point-to-Point Protocol inet addr:100.0.0.1 P-t-P:100.0.0.100 Mask:255.255.255.255 inet6 addr: fe80::70b2:2149:2eea:8daf/10 Scope:Link UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1480 Metric:1 RX packets:139 errors:0 dropped:0 overruns:0 frame:0 TX packets:22 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:3 RX bytes:8730 (8.7 KB) TX bytes:1666 (1.6 KB路由器上面会出现一个pppoe-wan的端口，路由器可以正常ping 100.0.0.1
root@zihome:/# ifconfig pppoe-wan pppoe-wan Link encap:Point-to-Point Protocol inet addr:100.0.0.100 P-t-P:100.0.0.1 Mask:255.255.255.255 inet6 addr: fe80::14ec:b7:dc40:32f6/10 Scope:Link UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1480 Metric:1 RX packets:22 errors:0 dropped:0 overruns:0 frame:0 TX packets:220 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:3 RX bytes:1666 (1.6 KiB) TX bytes:13939 (13.6 KiB)PPP IPV6CP请求成功之后会，两端都有各自的本地链路IPV6地址，后面就可以启动odhcp6c客户端去获取ipv6全球地址了。
ipv6的dhcpv6服务器是要建立在ppp0/pppoe-wan端口的基础上，所以要在ppp0拨号成功后，在路由器odhcp6c客户端的DHCP请求超时之前，ubuntu要启动在ppp0端口上的dibbler服务器。
修改
sudo vim /etc/dibbler/server.conf里面的端口为ppp0启动dibbler服务器
sudo /etc/init.d/dibbler-server start后面就是走正常的dhcpv6协议了，odhcp6c进程会在pppoe-wan启动之后自动被拉起来，开始请求dhcpv6地址。
ping本地链路地址的时候使用ping6指定端口
ping6 -I ppp0 fe80::2214:7ff:fe11:2a21路由器支持ipv4和ipv6的pppoe在同一个会话pppoe-wan，也可以支持ipv4和ipv6在不同的会话，ipv4位于pppoe-wan，ipv6位于pppoe-wan2。
当在同一会话时，跟上面说到的配置一致
config interface 'wan' option ipv6 '1' option def_ifname 'eth1' option ifname 'eth1' option macaddr 'DC:4B:DD:1d:fa:49' option web_proto 'pppoe' option proto 'pppoe' option pppoe_username 'WkhPTUVfRkE0OF81Rw==' option username 'ZHOME_FA48_5G' option pppoe_password 'MTIzNDU2Nzg=' option password '12345678' option pppoe_peerdns '1' option peerdns '1' option pppoe_advance '0' option sdial '0' config interface 'wan6' option ifname 'pppoe-wan' option proto 'dhcpv6'当在两个会话时，添加一个wan2，把wan的ipv6设置为0，wan6的ifname改成pppoe-wan2
config interface 'wan' option ipv6 '0' option def_ifname 'eth1' option ifname 'eth1' option macaddr 'DC:4B:DD:1d:fa:49' option web_proto 'pppoe' option proto 'pppoe' option pppoe_username 'WkhPTUVfRkE0OF81Rw==' option username 'ZHOME_FA48_5G' option pppoe_password 'MTIzNDU2Nzg=' option password '12345678' option pppoe_peerdns '1' option peerdns '1' option pppoe_advance '0' option sdial '0' config interface 'wan2' option ipv6 '1' option def_ifname 'eth1' option ifname 'eth1' option macaddr 'DC:4B:DD:1d:fa:49' option web_proto 'pppoe' option proto 'pppoe' option pppoe_username 'WkhPTUVfRkE0OF81Rw==' option username 'ZHOME_FA48_5G' option pppoe_password 'MTIzNDU2Nzg=' option password '12345678' option pppoe_peerdns '1' option peerdns '1' option pppoe_advance '0' option sdial '0' config interface 'wan6' option ifname 'pppoe-wan2' option proto 'dhcpv6'