從 ipv6 dhcp 伺服器獲取 IP

我有以下實驗室：

DHCP 伺服器

$$ Centos 6 $$

/etc/dhcp/dhcpd6.conf

default-lease-time 2592000;
preferred-lifetime 604800;
option dhcp-renewal-time 3600;
option dhcp-rebinding-time 7200;
allow leasequery;
option dhcp6.info-refresh-time 21600;


dhcpv6-lease-file-name "/var/lib/dhcpd/dhcpd6.leases";

subnet6 3ffe:501:ffff:100::/64 {
}

host ipv6host {
   hardware ethernet 53:54:00:70:1d:ed;
   fixed-address6 3ffe:501:ffff:100::222;
   if packet(0,1) = 1 { log(debug,"Request match!"); }
}

# ip -6 addr show
5: eth1.30@if3: <BROADCAST,MULTICAST,UP,LOWER_UP,M-DOWN> mtu 1500
   inet6 3ffe:501:ffff:100::4/64 scope global 
      valid_lft forever preferred_lft forever

在客戶端沒有特殊配置。然後，執行 dhcp 伺服器，我得到以下輸出：

Internet Systems Consortium DHCP Server 4.1.1-P1
Copyright 2004-2010 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/
Not searching LDAP since ldap-server, ldap-port and ldap-base-dn were not specified in         the config file
Wrote 0 deleted host decls to leases file.
Wrote 0 new dynamic host decls to leases file.
Wrote 0 leases to leases file.
Bound to *:547
Listening on Socket/5/eth1.30/3ffe:501:ffff:100::/64
Sending on   Socket/5/eth1.30/3ffe:501:ffff:100::/64

Solicit message from fe80::5054:ff:fe70:1ded port 546, transaction ID 0xDF54D000
Request match!
Request match!
Sending Advertise to fe80::5054:ff:fe70:1ded port 546
Solicit message from fe80::5054:ff:fe70:1ded port 546, transaction ID 0xDF54D000
Request match!
Request match!
Sending Advertise to fe80::5054:ff:fe70:1ded port 546
... and more

在客戶端上，我得到以下執行客戶端：

dhclient -6 -d  eth1
Internet Systems Consortium DHCP Client 4.1.1-P1
Copyright 2004-2010 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Bound to *:546
Listening on Socket/eth1
Sending on   Socket/eth1
PRC: Soliciting for leases (INIT).
XMT: Forming Solicit, 0 ms elapsed.
XMT:  X-- IA_NA 00:70:1d:ed
XMT:  | X-- Request renew in  +3600
XMT:  | X-- Request rebind in +5400
XMT: Solicit on eth1, interval 1010ms.
XMT: Forming Solicit, 1010 ms elapsed.
XMT:  X-- IA_NA 00:70:1d:ed
XMT:  | X-- Request renew in  +3600
XMT:  | X-- Request rebind in +5400
XMT: Solicit on eth1, interval 2070ms.    

如您所見，似乎伺服器從客戶端獲取請求並匹配主機條目。我不知道為什麼客戶端沒有獲得IP。

注意：客戶端是一個虛擬機，在虛擬機管理程序中，vnic 連接到帶有 eth1.30 的網橋。節點之間的流量還可以。

解決了！

問題是ip6tables。預設規則阻止來自 DHCP 伺服器的廣告。

service ip6tables stop

會解決這個問題。看看其他答案的評論，因為我使用的範圍似乎不好。

重要。至少有 2 個 Centos 6 盒子（伺服器和客戶端）使用 MAC 地址分配 ip 工作正常。

來源： http ://www.redhat.com/archives/anaconda-devel-list/2010-November/msg00172.html

在 DHCPv6 中，客戶端不再使用其 MAC 地址來辨識，而是使用 DUID（客戶端的所有介面都相同，因此理論上更容易辨識客戶端）。因此，您還應該將主機定義放在子網塊中。根據介面和 DUID 組合，系統可能具有不同的地址。這是來自Linux IPv6 how-to的範例：

default-lease-time 600;
max-lease-time 7200; 
log-facility local7; 
subnet6 2001:db8:0:1::/64 {
   # Range for clients
   range6 2001:db8:0:1::129 2001:db8:0:1::254;

   # Range for clients requesting a temporary address
   range6 2001:db8:0:1::/64 temporary;

   # Additional options
   option dhcp6.name-servers 2001:4860:4860::8888;
   option dhcp6.domain-search "domain.example";

   # Prefix range for delegation to sub-routers
   prefix6 2001:db8:0:100:: 2001:db8:0:f00:: /56;

   # Example for a fixed host address
   host specialclient {
       host-identifier option dhcp6.client-id 00:01:00:01:4a:1f:ba:e3:60:b9:1f:01:23:45;
       fixed-address6 2001:db8:0:1::127;
   } 
}

您可以從伺服器日誌中獲取客戶端的 DUID，也可以從客戶端中提取它。這是一個解析dhcp6c為儲存生成的 DUID 而創建的文件的範例：

hexdump -e '"%07.7_ax " 1/2 "%04x" " " 14/1 "%02x:" "\n"' /var/lib/dhcpv6/dhcp6c_duid

所有範例均基於操作指南中的範例。

引用自：https://serverfault.com/questions/513772