IPv6 地址更新脚本

用于当 RouterOS IPv6 更新时，主动向客户端广播旧地址过期

:local poolname "pool6"
:local ifname "bridge"

:global oldprefix;
:local newprefix;

:set $newprefix [/ipv6 pool used get [find info="bridge"] prefix];

:if ([ :typeof $oldprefix ] = "nothing") do {
  :set $oldprefix $newprefix
}

:if ($newprefix != $oldprefix) do {
  :log info "Kill IPv6 prefix, old prefix: $oldprefix, new prefix: $newprefix";
  :ipv6 nd prefix add prefix=$oldprefix interface=$ifname on-link=yes autonomous=yes preferred-lifetime=0s valid-lifetime=0s;
  :delay 5;
  :ipv6 nd prefix remove [/ipv6 nd prefix find prefix=$oldprefix];
  :set $oldprefix $newprefix;
}

---

IPv6 DHCP Rebinding 脚本

用于修复当 PPPoE 重新拨号时 IPv6 DHCP 卡在 Rebinding 状态

:local wan "pppoe-telecom"
:if ( [ /ipv6 dhcp-client get [ find interface=$wan ] status ] = "rebinding..." ) do={ 
    /ipv6 dhcp-client release [ find interface=$wan ] 
}

---

IPv6 自动更新当前 Prefix 到 Prefix Hint

如果提供了 IPv6 prefix hint，那么有可能拿到 hint 里的 prefix

:local interfaceName "pppoe-telecom";

:local oldIP6Prefix [ /ipv6 dhcp-client get [find interface=$interfaceName] prefix-hint ]

:local ip6Prefix [ /ipv6 dhcp-client get [find interface=$interfaceName] prefix ]
:set ip6Prefix [ :pick $ip6Prefix 0 [ :find $ip6Prefix "," ] ] ;

:if ($oldIP6Prefix != $ip6Prefix) \
do={
    /ipv6 dhcp-client set prefix-hint=$ip6Prefix [find interface=$interfaceName] 
    :log info ("Update IPv6 Prefix Hint: " . $ip6Prefix);
}

---

IPv6 自动修改 MSS

可以极大缓解 IPv6 网页打不开的问题

/ipv6 firewall mangle
add action=change-mss chain=forward new-mss=clamp-to-pmtu passthrough=yes protocol=tcp tcp-flags=syn