运营商给了一个2401:xxxx:: 64 前缀,内部通过NAT66 目前出现用户端得去ping一下运营商v6网关,才能正常使用v6地址,大佬帮忙看看
#
sysname H3C
#
clock protocol none
#
context Admin id 1
#
irf mac-address persistent timer
irf auto-update enable
irf auto-merge enable
undo irf link-delay
irf member 1 priority 1
#
dhcp enable
#
dns server 8.8.8.8
dns server 114.114.114.114
#
ipv6 dhcp prefix-pool 64 prefix FD01:203:405::/64 assign-len 64
#
password-recovery enable
#
vlan 1
#
vlan 20
#
object-group ipv6 address 2401:xxxx:0::/64
0 network subnet 2401:xxxx::/64
#
object-group ipv6 address FD01:203:405::1/64
security-zone Trust
0 network subnet FD01:203:405::/64
#
dhcp server ip-pool vlan20
gateway-list 192.168.20.1
network 192.168.20.0 mask 255.255.255.0
dns-list 223.5.5.5
#
ipv6 dhcp pool 1
network 2401:xxxx::/64
dns-server 2401:CE00:5000:4::200
dns-server 2401:CE00:5000:4::228
dns-server 2401:CE00:5000:4::245
prefix-pool 64
gateway-list 2401:xxxx::1
#
ipv6 dhcp pool 2
network FD01:203:405::/64
dns-server 2401:CE00:5000:4::200
dns-server 2401:CE00:5000:4::228
dns-server 2401:CE00:5000:4::245
prefix-pool 64
gateway-list FD01:203:405::1
#
controller Cellular1/0/0
#
controller Cellular1/0/1
#
interface NULL0
#
interface GigabitEthernet1/0/0
port link-mode route
ip address 192.168.0.1 255.255.255.0
#
interface GigabitEthernet1/0/1
port link-mode route
ip address 192.168.20.1 255.255.255.0
manage ping inbound
manage ping outbound
ipv6 dhcp select server
ipv6 dhcp server apply pool 2
ipv6 address FD01:203:405::1/64
undo ipv6 nd ra halt
#
interface GigabitEthernet1/0/2
port link-mode route
#
interface GigabitEthernet1/0/3
port link-mode route
#
interface GigabitEthernet1/0/4
port link-mode route
#
interface GigabitEthernet1/0/5
port link-mode route
#
interface GigabitEthernet1/0/6
port link-mode route
#
interface GigabitEthernet1/0/7
port link-mode route
description GuideWan Interface
bandwidth 1000000
ip address 218.108.xxx.xxx 255.255.255.248
dns server 223.5.5.5
dns server 223.6.6.6
nat66 prefix source FD01:203:405:: 64 2401:xxxx:: 64
nat66 prefix destination 2401:xxxx:: 64 FD01:203:405:: 64
manage https inbound
manage https outbound
manage ping inbound
manage ping outbound
manage ssh inbound
manage ssh outbound
ipv6 address 2401:xxxx::/64 eui-64
proxy-nd enable
local-proxy-nd enable
undo ipv6 nd ra halt
gateway 218.108.xxx.xx
#
interface GigabitEthernet1/0/8
port link-mode route
#
interface GigabitEthernet1/0/9
port link-mode route
#
interface GigabitEthernet1/0/10
port link-mode route
#
interface GigabitEthernet1/0/11
port link-mode route
#
interface GigabitEthernet1/0/12
port link-mode route
#
interface GigabitEthernet1/0/13
port link-mode route
#
interface GigabitEthernet1/0/14
port link-mode route
#
interface GigabitEthernet1/0/15
port link-mode route
#
interface GigabitEthernet1/0/16
port link-mode route
#
interface GigabitEthernet1/0/17
port link-mode route
#
interface GigabitEthernet1/0/18
port link-mode route
#
interface GigabitEthernet1/0/19
port link-mode route
#
interface GigabitEthernet1/0/20
port link-mode route
#
interface GigabitEthernet1/0/21
port link-mode route
#
interface GigabitEthernet1/0/22
port link-mode route
#
interface GigabitEthernet1/0/23
port link-mode route
#
interface Ten-GigabitEthernet1/2/0
port link-mode route
#
interface Ten-GigabitEthernet1/2/1
port link-mode route
#
interface Ten-GigabitEthernet1/2/2
port link-mode route
#
interface Ten-GigabitEthernet1/2/3
port link-mode route
#
security-zone name Local
#
security-zone name Trust
import interface GigabitEthernet1/0/1
#
security-zone name DMZ
#
security-zone name Untrust
import interface GigabitEthernet1/0/7
import interface GigabitEthernet1/0/8
#
security-zone name Management
import interface GigabitEthernet1/0/0
#
scheduler logfile size 16
#
line class aux
user-role network-operator
#
line class console
authentication-mode scheme
user-role network-admin
#
line class vty
user-role network-operator
#
line aux 0
user-role network-admin
#
line con 0
user-role network-admin
#
line vty 0 63
authentication-mode scheme
user-role network-admin
#
ipv6 neighbor 2401:xxxx::1 743a-2020-7401 interface GigabitEthernet1/0/7
#
ipv6 route-static :: 0 GigabitEthernet1/0/7 2401:xxxx::1
(0)
最佳答案
根据配置和现象分析,用户端IPv6通信依赖手动触发ping操作的问题根源在于NDP(邻居发现协议)缓存未及时更新,导致设备无法主动建立IPv6网关的邻居表项。以下是详细分析及修复步骤:
静态邻居条目异常
配置中存在静态ND条目:
ipv6 neighbor 2401:xxxx::1 743a-2020-7401 interface GigabitEthernet1/0/7
该条目强制绑定了运营商网关的IPv6地址与MAC地址。若运营商网关实际MAC地址变更或配置错误,将导致ND表项失效,需手动触发更新后才能恢复
Proxy-ND功能冲突
GigabitEthernet1/0/7接口同时启用了proxy-nd
和local-proxy-nd
,但在NAT66场景下,此配置可能导致设备错误响应ND请求,干扰正常邻居发现流程4。
NAT66映射规则缺陷
当前NAT66配置:
nat66 prefix source FD01:203:405:: 64 2401:xxxx:: 64
nat66 prefix destination 2401:xxxx:: 64 FD01:203:405:: 64
未明确指定转换方向和应用接口,可能导致地址转换规则未正确生效。
步骤1:清理冲突的ND代理配置
在GigabitEthernet1/0/7接口关闭Proxy-ND功能:
interface GigabitEthernet1/0/7
undo proxy-nd
undo local-proxy-nd
注:NAT66场景下无需启用Proxy-ND,避免与地址转换规则冲突
步骤2:优化NAT66规则定义
修正NAT66映射规则,明确转换方向并绑定到外网接口:
nat66 outbound prefix FD01:203:405::/64 to 2401:xxxx::/64
说明:outbound
参数确保内网到外网的流量触发源地址转换,无需双向映射
步骤3:移除静态ND条目依赖
删除静态ND配置,依赖动态学习:
undo ipv6 neighbor 2401:xxxx::1
风险规避:若运营商网关MAC固定,可保留该条目但需确认MAC地址准确性
步骤4:增强RA(路由通告)配置
确保内网接口GigabitEthernet1/0/1正确通告默认路由:
interface GigabitEthernet1/0/1
ipv6 nd ra router-lifetime 1800
ipv6 nd ra interval 200 300
作用:缩短RA通告间隔,加速客户端默认路由学习
步骤5:验证ND表项生成
通过命令检查ND表项是否自动生成:
display ipv6 neighbors interface GigabitEthernet1/0/7
预期输出:应存在2401:xxxx::1
的动态(DYNAMIC)条目,状态为REACHABLE3
实时NDP调试
启用NDP调试日志:
terminal monitor
terminal debugging
debugging ipv6 nd all
观察用户端首次访问时是否生成正确的ND请求/响应记录。
NAT66转换验证
执行流量测试并检查会话表:
display nat66 session
确认内网地址(FD01:203:405::/64)正确转换为公网前缀(2401:xxxx::/64)。
路由可达性测试
在内网主机执行:
ping ipv6 2401:CE00:5000:4::200 # 测试DNS服务器可达性
traceroute ipv6 ***.*** # 验证路径是否经过NAT66转换
问题层级 | 具体原因 |
---|---|
邻居发现机制 | 静态ND条目与Proxy-ND功能冲突,导致设备无法动态学习网关MAC地址 |
NAT66规则 | 双向映射规则冗余,未明确转换方向,造成部分流量未触发地址转换 |
路由通告 | RA参数未优化,客户端默认路由更新延迟 |
通过修正ND代理配置、优化NAT66规则及增强RA通告,可消除手动触发ping的需求,实现IPv6连接的自动建立。
(0)
nd代理是nat66转换后前缀和出口前缀是一样的,所以才配置的,其他的测试了一下好像还是不行
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nd代理是nat66转换后前缀和出口前缀是一样的,所以才配置的,其他的测试了一下好像还是不行