修改單個引數（直接 sysctl -w 修改即可）（永久生效）
[root@ufo130 eth0]
# sysctl -w net.ipv4.neigh.eth0.base_reachable_time=5
net.ipv4.neigh.eth0.base_reachable_time = 5
[root@ufo130 eth0]
# [root@ufo130 eth0]
# cat base_reachable_time
5[root@ufo130 eth0]
# cat base_reachable_time_ms
5000
[root@ufo130 eth0]
# cat /etc/sysctl.conf | grep net.ipv4.neigh.eth0.base_reachable_time
net.ipv4.neigh.eth0.base_reachable_time = 10
[root@ufo130 eth0]
# /sbin/sysctl -p /etc/sysctl.conf
[root@ufo130 eth0]
# cat base_reachable_time
10[root@ufo130 eth0]
# cat base_reachable_time_ms
10000
# 新增浮動ip
[root@ufo130 eth0]
# ip a add 192.168.71.160/24 dev eth0
# 刪除浮動ip
[root@ufo130 eth0]
# ip a del 192.168.71.160/24 dev eth0
# ip a 檢視
# arping -i 網絡卡位址 -c 3 -s vip位址 閘道器位址
[root@ufo130 eth0]
# arping -i eth0 -c 3 -s 192.168.71.160 192.168.71.2
arping 192.168.71.2 from 192.168.71.160 eth0
unicast reply from 192.168.71.2 [00:50:56:ea:bd:c4] 3.136ms
unicast reply from 192.168.71.2 [00:50:56:ea:bd:c4] 0.879ms
unicast reply from 192.168.71.2 [00:50:56:ea:bd:c4] 0.994ms
sent 3 probes (1 broadcast(s)
)received 3 response(s)
cat
/proc/sys/net/ipv4/neigh/eth0/base_reachable_time
[root@ufo130 eth0]
# ip neigh
192.168.71.1 dev eth0 lladdr 00:50:56:c0:00:08 reachable
192.168.71.2 dev eth0 lladdr 00:50:56:ea:bd:c4 stale
[root@ufo130 eth0]
# ip neigh
192.168.71.1 dev eth0 lladdr 00:50:56:c0:00:08 reachable
192.168.71.2 dev eth0 lladdr 00:50:56:ea:bd:c4 stale
[root@ufo130 eth0]
# arping -i eth0 -c 3 -s 192.168.71.130 192.168.71.2
arping 192.168.71.2 from 192.168.71.130 eth0
unicast reply from 192.168.71.2 [00:50:56:ea:bd:c4] 1.592ms
unicast reply from 192.168.71.2 [00:50:56:ea:bd:c4] 0.973ms
unicast reply from 192.168.71.2 [00:50:56:ea:bd:c4] 0.865ms
sent 3 probes (1 broadcast(s)
)received 3 response(s)
[root@ufo130 eth0]
# ip neigh
192.168.71.1 dev eth0 lladdr 00:50:56:c0:00:08 reachable
192.168.71.2 dev eth0 lladdr 00:50:56:ea:bd:c4 reachable
【linux實現的arp快取老化時間原理解析】
【虛擬ip理解】
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