问

MSR2600如何ARP绑定

DHCP

2020-11-13提问

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zhiliao_j4U9x

zhiliao_j4U9x 零段

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问题描述：

公司大约100台电脑每天早上上班都有电脑连接不上网获取不到ip，固定个ip就好了；如何在路由器中配置ARP自动固化？

组网及组网描述：

最佳答案

咸蛋黄

咸蛋黄六段

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1、PC1只能使用10.0.0.1进行上网，其他终端不可以使用该IP上网。

2、只允许静态ARP绑定的终端能够上网，未绑定的终端不可以上网。比如PC1静态ARP绑定后可以上网，PC2未绑定不可以上网。

1、静态ARP绑定：

[MSR]arp static 10.0.0.1 74e4-011f-0306

其中查看ip对应mac地址，可通过：

[MSR]display arp interface GigabitEthernet 0/0

Type: S-Static D-Dynamic O-Openflow R-Rule M-Multiport I-Invalid

IP address MAC address SVLAN/VSI Interface/Link ID Aging Type

10.0.0.1 74e4-011f-0306 -- GE0/0 -- S

10.0.0.2 74e4-0ddc-0406 -- GE0/0 13 D

测试：

将PC2的ip地址改为10.0.0.1后做ping测试：

<PC2>ping 10.0.0.3

Ping 10.0.0.3 (10.0.0.3): 56 data bytes, press CTRL_C to break

Request time out

--- Ping statistics for 10.0.0.3 ---

5 packet(s) transmitted, 0 packet(s) received, 100.0% packet loss

<H3C>%Dec 20 19:25:24:217 2017 H3C PING/6/PING_STATISTICS: Ping statistics for 10.0.0.3: 5 packet(s) transmitted, 0 packet(s) received, 100.0% packet loss.

2、只允许静态ARP绑定的终端能够上网，未绑定的终端不可以上网：

在路由器接口下将max-learning-num设置为0，路由器在该接口下将无法动态学习终端的MAC地址，使得PC2无法正常上网。

[MSR-GigabitEthernet0/0]arp max-learning-num 0

如果在接口下配置max-learning-num之前路由器已经学到了PC2的MAC地址，那么需要等到ARP表项老化后PC2才无法上网。也可以手工清空ARP表项。

手工清空ARP表项命令：

<MSR>reset arp interface GigabitEthernet 0/0

测试：

没有配置max-learning-num之前做ping测试：

[PC1]ping 10.0.0.3

Ping 10.0.0.3 (10.0.0.3): 56 data bytes, press CTRL_C to break

56 bytes from 10.0.0.3: icmp_seq=0 ttl=255 time=1.000 ms

56 bytes from 10.0.0.3: icmp_seq=1 ttl=255 time=1.000 ms

56 bytes from 10.0.0.3: icmp_seq=2 ttl=255 time=1.000 ms

56 bytes from 10.0.0.3: icmp_seq=3 ttl=255 time=1.000 ms

56 bytes from 10.0.0.3: icmp_seq=4 ttl=255 time=1.000 ms

--- Ping statistics for 10.0.0.3 ---

5 packet(s) transmitted, 5 packet(s) received, 0.0% packet loss

round-trip min/avg/max/std-dev = 1.000/1.000/1.000/0.000 ms

[H3C]%Dec 20 19:29:31:541 2017 H3C PING/6/PING_STATISTICS: Ping statistics for 10.0.0.3: 5 packet(s) transmitted, 5 packet(s) received, 0.0% packet loss, round-trip min/avg/max/std-dev = 1.000/1.000/1.000/0.000 ms.

<PC2>ping 10.0.0.3

Ping 10.0.0.3 (10.0.0.3): 56 data bytes, press CTRL_C to break

56 bytes from 10.0.0.3: icmp_seq=0 ttl=255 time=1.000 ms

56 bytes from 10.0.0.3: icmp_seq=1 ttl=255 time=1.000 ms

56 bytes from 10.0.0.3: icmp_seq=2 ttl=255 time=1.000 ms

56 bytes from 10.0.0.3: icmp_seq=3 ttl=255 time=1.000 ms

56 bytes from 10.0.0.3: icmp_seq=4 ttl=255 time=1.000 ms

--- Ping statistics for 10.0.0.3 ---

5 packet(s) transmitted, 5 packet(s) received, 0.0% packet loss

round-trip min/avg/max/std-dev = 1.000/1.000/1.000/0.000 ms

<H3C>%Dec 20 19:31:07:622 2017 H3C PING/6/PING_STATISTICS: Ping statistics for 10.0.0.3: 5 packet(s) transmitted, 5 packet(s) received, 0.0% packet loss, round-trip min/avg/max/std-dev = 1.000/1.000/1.000/0.000 ms.

[MSR]dis arp interface GigabitEthernet 0/0

Type: S-Static D-Dynamic O-Openflow R-Rule M-Multiport I-Invalid

IP address MAC address SVLAN/VSI Interface/Link ID Aging Type

10.0.0.1 74e4-011f-0306 -- GE0/0 -- S

10.0.0.2 74e4-0ddc-0406 -- GE0/0 19 D

配置max-learning-num之后做ping测试（ping之前先清空ARP表项）：

[PC1]ping 10.0.0.3

Ping 10.0.0.3 (10.0.0.3): 56 data bytes, press CTRL_C to break

56 bytes from 10.0.0.3: icmp_seq=0 ttl=255 time=1.000 ms

56 bytes from 10.0.0.3: icmp_seq=1 ttl=255 time=1.000 ms

56 bytes from 10.0.0.3: icmp_seq=2 ttl=255 time=1.000 ms

56 bytes from 10.0.0.3: icmp_seq=3 ttl=255 time=1.000 ms

56 bytes from 10.0.0.3: icmp_seq=4 ttl=255 time=1.000 ms

--- Ping statistics for 10.0.0.3 ---

5 packet(s) transmitted, 5 packet(s) received, 0.0% packet loss

round-trip min/avg/max/std-dev = 1.000/1.000/1.000/0.000 ms

[H3C]%Dec 20 19:35:11:960 2017 H3C PING/6/PING_STATISTICS: Ping statistics for 10.0.0.3: 5 packet(s) transmitted, 5 packet(s) received, 0.0% packet loss, round-trip min/avg/max/std-dev = 1.000/1.000/1.000/0.000 ms.

<PC2>ping 10.0.0.3

Ping 10.0.0.3 (10.0.0.3): 56 data bytes, press CTRL_C to break

Request time out

--- Ping statistics for 10.0.0.3 ---

5 packet(s) transmitted, 0 packet(s) received, 100.0% packet loss

<H3C>%Dec 20 19:36:54:220 2017 H3C PING/6/PING_STATISTICS: Ping statistics for 10.0.0.3: 5 packet(s) transmitted, 0 packet(s) received, 100.0% packet loss.

[MSR]dis arp interface GigabitEthernet 0/0
    Type: S-Static   D-Dynamic   O-Openflow   R-Rule   M-Multiport I-Invalid
    IP address       MAC address    SVLAN/VSI Interface/Link ID        Aging Type
    10.0.0.1         74e4-011f-0306 --        GE0/0                    --    S

1、在接口下配置max-learning-num之前，如果路由器已经学到了PC2的MAC地址，那么配置该命令无法立即生效，需要等到ARP表项老化后PC2才会无法上网。所以在配置完成后，可以手工清空ARP表项。

2、reset arp all命令会把所有arp表项删除，包括静态ARP的配置。所以可以通过reset arp interface GigabitEthernet 0/0清空接口ARP的动态表项。