keepalived非爭搶機制不生效【原創】

故障現象：倆臺服務器設置了keepalived非爭搶機制，可是發現優先級高的服務器仍是會優先獲取vip

利用tcpdump抓包發現只有其中一臺服務器，沒有另外一臺

tcpdump -i eth0 vrrp -n
10:06:47.483004 IP 10.12.75.73 > 224.0.0.18: VRRPv2, Advertisement, vrid 72, prio 80, authtype simple, intvl 1s, length 20
10:06:48.483032 IP 10.12.75.73 > 224.0.0.18: VRRPv2, Advertisement, vrid 72, prio 80, authtype simple, intvl 1s, length 20
10:06:49.483287 IP 10.12.75.73 > 224.0.0.18: VRRPv2, Advertisement, vrid 72, prio 80, authtype simple, intvl 1s, length 20
10:06:50.483382 IP 10.12.75.73 > 224.0.0.18: VRRPv2, Advertisement, vrid 72, prio 80, authtype simple, intvl 1s, length 20

經查發現另外一臺開啓防火牆，致使vrrp通訊有問題