有没有办法让keepalived定期发送无偿ARP？
我们有以下情况：
>交换机故障(VLAN设置)
> keepalived failovered to backup instance
>备份实例发送免费ARP但思科ASA设备没有得到它(因为交换机故障)
>当交换机恢复时(几分钟后)VIP无法访问,因为ASA没有刷新ARP表(ARP表到期时间设置为4h)
>由于ASA已经从之前的活动节点获得了MAC,因此它没有发送ARP请求
>在我们重新启动keepalived实例启动新GARP之前,VIP无法访问
因此,我们认为我们可以通过定期GARP来避免这种情况.这是一个很好的方法,有没有办法在keepalived内做到这一点？
还有其他建议可以避免这种问题吗？
Keepalived配置：
global_defs {
notification_email {
email@address.com
}
notification_email_from SERVER_1
smtp_server smtp.server.local
smtp_connect_timeout 30
router_id SERVER_1
}
vrrp_instance V1 {
state BACKUP
nopreempt
interface eth0
lvs_sync_daemon_interface eth0
virtual_router_id 150
priority 120
advert_int 1
persistence_timeout 0
smtp_alert
authentication {
auth_type PASS
auth_pass xxx
}
virtual_ipaddress {
10.xxx.xxx.xxx
}
}
解决方法
keepalived版本1.2.20及更高版本支持以下关于免费ARP的配置设置,vrrp_garp_master_refresh是我需要的.
# delay for second set of gratuitous ARPs after transition to MASTER
vrrp_garp_master_delay 10 # seconds,default 5,0 for no second set
# number of gratuitous ARP messages to send at a time after transition to MASTER
vrrp_garp_master_repeat 1 # default 5
# delay for second set of gratuitous ARPs after lower priority advert received when MASTER
vrrp_garp_lower_prio_delay 10
# number of gratuitous ARP messages to send at a time after lower priority advert received when MASTER
vrrp_garp_lower_prio_repeat 1
# minimum time interval for refreshing gratuitous ARPs while MASTER
vrrp_garp_master_refresh 60 # secs,default 0 (no refreshing)
# number of gratuitous ARP messages to send at a time while MASTER
vrrp_garp_master_refresh_repeat 2 # default 1
# Delay in ms between gratuitous ARP messages sent on an interface
vrrp_garp_interval 0.001 # decimal,seconds (resolution usecs). Default 0.
# Delay in ms between unsolicited NA messages sent on an interface
vrrp_gna_interval 0.000001 # decimal,seconds (resolution usecs). Default 0.
