openwrt上面的dhcpv6服务器package一般使用odhcpd，里面即包含了有状态的dhcpv6服务器，也包含了无状态的ra服务器。
1.odhcpd服务器启动过程
开启config配置
CONFIG_PACKAGE_odhcpd=y
CONFIG_PACKAGE_odhcpd_ext_prefix_class=0
CONFIG_PACKAGE_odhcpd_ext_cer_id=0
etc/init.d/odhcpd会启动服务器进程
#!/bin/sh /etc/rc.common
START=35
STOP=85
USE_PROCD=1
start_service() {
procd_open_instance
procd_set_param command /usr/sbin/odhcpd
procd_set_param respawn
procd_close_instance
}
service_triggers()
{
procd_add_reload_trigger "dhcp"
}
odhcpd进程里面回去读/etc/config/dhcp uci的值
config dhcp 'lan'
option interface 'lan'
option start '100'
option limit '150'
option leasetime '12h'
option force '1'
option dhcpv6 'server'
option ra 'server'
config odhcpd 'odhcpd'
option maindhcp '0'
option leasefile '/tmp/hosts/odhcpd'
option leasetrigger '/usr/sbin/odhcpd-update'
- option dhcpv6 'server'表示启动dhcpv6 server
- option ra 'server'表示启动ra/SLACC server
uci的全部设置值在网址：https://openwrt.org/docs/techref/odhcpd
下可以看到全部的，这边介绍一部分用到的。
odhcpd的参数基本不会变，如下：
config odhcpd 'odhcpd'
option maindhcp '0'
option leasefile '/tmp/hosts/odhcpd' # DHCP/v6 lease/hostfile
option leasetrigger '/usr/sbin/odhcpd-update' # Lease trigger script
dhcp的参数如下：
Sections of type dhcp (configure DHCP / DHCPv6 / RA / NDP service)
Option Type Default Description
interface string <name of UCI section> logical OpenWrt interface
ifname string <resolved from logical> physical network interface
ignore bool 0 do not serve this interface
unless overridden by ra, ndp,
dhcpv4 or dhcpv6 options
master bool 0 is a master interface
for relaying
ra string disabled Router Advert service
[disabled|server|relay|hybrid]
dhcpv6 string disabled DHCPv6 service
[disabled|server|relay|hybrid]
dhcpv4 string disabled DHCPv4 service
[disabled|server]
ndp string disabled Neighbor Discovery Proxy
[disabled|relay|hybrid]
dynamicdhcp bool 1 dynamically create leases
for DHCPv4 and DHCPv6
dns list <local address> DNS servers to announce
accepts IPv4 and IPv6
domain list <local search domain> Search domains to announce
ra_default integer 0 Override default route
0: default
1: ignore no public address
2: ignore all
ra_management integer 1 RA management mode
0: no M-Flag but A-Flag
1: both M and A
2: M but not A
ra_offlink bool 0 Announce prefixes off-link
ra_preference string medium Route(r) preference
[medium|high|low]
ra_maxinterval integer 600 Maximum time allowed between
sending unsolicited RA
ra_mininterval integer 200 Minimum time allowed between
sending unsolicited RA
ra_lifetime integer 1800 Value to be placed in Router
Lifetime field of RA
ra_useleasetime bool 0 Use configured leasetime as
limit for the preferred and
valid lifetime of a prefix
ra_reachabletime integer 0 Reachable Time in milliseconds to be
advertised in RA messages
ra_retranstime integer 0 Retransmit Time in milliseconds to be
advertised in RA messages
ra_hoplimit integer 0 Current hoplimit to be advertised
in RA messages
ra_mtu integer 0 MTU to be advertised in
RA messages
ndproxy_routing bool 1 Learn routes from NDP
ndproxy_slave bool 0 NDProxy external slave
ndproxy_static list Static NDProxy prefixes
host的参数如下：
Sections of type host (static leases)
Option Type Default Description
ip string IP-Address to lease
mac string MAC-address
duid string DUID in base16
hostid string IPv6 host identifier
name string Hostname
2. dhcpv6=server,ra=disabled
dhcpv6在server模式支持全部的模式：stateless, stateful and PD-server mode
config dhcp 'lan'
option interface 'lan'
option start '100'
option limit '150'
option leasetime '12h'
option force '1'
option dhcpv6 'server'
option ra 'disabled'
config dhcp 'wan'
option interface 'wan'
option ignore '1'
win电脑连接路由器后，电脑会向路由器的odhcpd服务器申请地址，路由器的地址为2001:db8:0:1::254/128，分配给win的地址为2001:db8:0:f00::3c3/128
root@zihome:/# cat /tmp/hosts/odhcpd
2001:db8:0:f00::3c3 DESKTOP-761V91F
# br-lan 000100012426e0d18cec4bcb4202 98cec4b DESKTOP-761V91F 1589774825 3c3 128 2001:db8:0:f00::3c3/128
在win上面可以通过ipconfig/all查看
C:\Users\SZTEST_>ipconfig/all
以太网适配器 以太网:
连接特定的 DNS 后缀 . . . . . . . : lan
描述. . . . . . . . . . . . . . . : Realtek PCIe GBE Family Controller
物理地址. . . . . . . . . . . . . : 8C-EC-4B-CB-42-02
DHCP 已启用 . . . . . . . . . . . : 是
自动配置已启用. . . . . . . . . . : 是
IPv6 地址 . . . . . . . . . . . . : 2001:db8:0:f00::3c3(首选)
获得租约的时间 . . . . . . . . . : 2020年5月18日 11:42:46
租约过期的时间 . . . . . . . . . : 2020年5月18日 11:54:39
本地链接 IPv6 地址. . . . . . . . : fe80::a9f1:2e40:14e2:6a01%22(首选)
IPv4 地址 . . . . . . . . . . . . : 192.168.18.172(首选)
子网掩码 . . . . . . . . . . . . : 255.255.255.0
获得租约的时间 . . . . . . . . . : 2020年5月18日 11:22:05
租约过期的时间 . . . . . . . . . : 2020年5月18日 23:42:31
默认网关. . . . . . . . . . . . . : 192.168.18.1
DHCP 服务器 . . . . . . . . . . . : 192.168.18.1
DHCPv6 IAID . . . . . . . . . . . : 160230475
DHCPv6 客户端 DUID . . . . . . . : 00-01-00-01-24-26-E0-D1-8C-EC-4B-CB-42-02
DNS 服务器 . . . . . . . . . . . : 2001:db8:0:f00::1
192.168.18.1
TCPIP 上的 NetBIOS . . . . . . . : 已启用
连接特定的 DNS 后缀搜索列表:
lan
win电脑后面就会定期的发送Renew，服务器返回Relay
3. dhcpv6=server,ra=server
- ubuntu把isc-dhcp和radvd服务器都开起来
- 路由器也把dhcpv6和ra两个服务器都开起来
这时候，odhcp6c可以获取到两个地址，一个dhcpv6分配的地址，一个通过RA协议自己算出的地址。
root@zihome:/# ifconfig eth1
eth1 Link encap:Ethernet HWaddr 08:10:7B:A7:26:3C
inet6 addr: 2016:ac11:5cad:0:a10:7bff:fea7:263c/64 Scope:Global
inet6 addr: fe80::a10:7bff:fea7:263c/64 Scope:Link
inet6 addr: 2001:db8:0:1::254/128 Scope:Global
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2288 errors:0 dropped:0 overruns:0 frame:0
TX packets:5709 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:387179 (378.1 KiB) TX bytes:830273 (810.8 KiB)
3. dhcpv6=disabled,ra=server
路由器上面ra为server，dhcpv6为disabled
ubuntu上面只开启isc-dhcp服务器，关闭radvd服务器
config dhcp 'lan'
option interface 'lan'
option start '100'
option limit '150'
option leasetime '12h'
option force '1'
option ra 'server'
option dhcpv6 'disabled'
config dhcp 'wan'
option interface 'wan'
option ignore '1'
4. dhcpv6=realy,ra=realy
对于路由器的中继模式，按照教程的设置一直没有成功，不知道是不是理解有问题。
# cat /etc/config/dhcp
config dhcp wan
option dhcpv6 relay
option ra relay
option ndp relay
option master 1
config dhcp lan
option dhcpv6 relay
option ra relay
option ndp relay
https://www.v2ex.com/t/176040
https://dev.archive.openwrt.org/ticket/16923
5.设备管理查看
也可以用ubus命令获取
ubus call dhcp ipv6leases
https://openwrt.org/zh/docs/guide-user/base-system/dhcp_configuration
网友评论