我在家里使用路由器连接互联网。我使用了 WPA2/AES 的长密码，更改了 SSID 并更改了默认密码。
但奇怪的是，即使我断开路由器与互联网的连接，我仍然会收到 UFW 阻止（每分钟都会发生一次，如下所示）
Apr 12 10:59:59 nori-hidamari kernel: [ 773.060910] [UFW BLOCK] IN=wlan0 OUT= MAC=fc:f8:ae:3d:f9:b9:3c:1e:04:7e:3d:32:08:00 SRC=192.168.0.1 DST=224.0.0.1 LEN=32 TOS=0x00 PREC=0x00 TTL=1 ID=19836 PROTO=2
Apr 12 11:00:59 nori-hidamari kernel: [ 833.031904] [UFW BLOCK] IN=wlan0 OUT= MAC=fc:f8:ae:3d:f9:b9:3c:1e:04:7e:3d:32:08:00 SRC=192.168.0.1 DST=224.0.0.1 LEN=32 TOS=0x00 PREC=0x00 TTL=1 ID=19838 PROTO=2
Apr 12 11:01:59 nori-hidamari kernel: [ 892.812248] [UFW BLOCK] IN=wlan0 OUT= MAC=fc:f8:ae:3d:f9:b9:3c:1e:04:7e:3d:32:08:00 SRC=192.168.0.1 DST=224.0.0.1 LEN=32 TOS=0x00 PREC=0x00 TTL=1 ID=19840 PROTO=2
Apr 12 11:02:59 nori-hidamari kernel: [ 952.666473] [UFW BLOCK] IN=wlan0 OUT= MAC=fc:f8:ae:3d:f9:b9:3c:1e:04:7e:3d:32:08:00 SRC=192.168.0.1 DST=224.0.0.1 LEN=32 TOS=0x00 PREC=0x00 TTL=1 ID=19842 PROTO=2
Apr 12 11:03:59 nori-hidamari kernel: [ 1012.649716] [UFW BLOCK] IN=wlan0 OUT= MAC=fc:f8:ae:3d:f9:b9:3c:1e:04:7e:3d:32:08:00 SRC=192.168.0.1 DST=224.0.0.1 LEN=32 TOS=0x00 PREC=0x00 TTL=1 ID=19852 PROTO=2
Apr 12 11:04:59 nori-hidamari kernel: [ 1072.520670] [UFW BLOCK] IN=wlan0 OUT= MAC=fc:f8:ae:3d:f9:b9:3c:1e:04:7e:3d:32:08:00 SRC=192.168.0.1 DST=224.0.0.1 LEN=32 TOS=0x00 PREC=0x00 TTL=1 ID=19854 PROTO=2
Apr 12 11:05:59 nori-hidamari kernel: [ 1132.392421] [UFW BLOCK] IN=wlan0 OUT= MAC=fc:f8:ae:3d:f9:b9:3c:1e:04:7e:3d:32:08:00 SRC=192.168.0.1 DST=224.0.0.1 LEN=32 TOS=0x00 PREC=0x00 TTL=1 ID=19856 PROTO=2
Apr 12 11:06:59 nori-hidamari kernel: [ 1192.248521] [UFW BLOCK] IN=wlan0 OUT= MAC=fc:f8:ae:3d:f9:b9:3c:1e:04:7e:3d:32:08:00 SRC=192.168.0.1 DST=224.0.0.1 LEN=32 TOS=0x00 PREC=0x00 TTL=1 ID=19910 PROTO=2
Apr 12 11:07:59 nori-hidamari kernel: [ 1252.057452] [UFW BLOCK] IN=wlan0 OUT= MAC=fc:f8:ae:3d:f9:b9:3c:1e:04:7e:3d:32:08:00 SRC=192.168.0.1 DST=224.0.0.1 LEN=32 TOS=0x00 PREC=0x00 TTL=1 ID=20730 PROTO=2
Apr 12 11:08:59 nori-hidamari kernel: [ 1312.009383] [UFW BLOCK] IN=wlan0 OUT= MAC=fc:f8:ae:3d:f9:b9:3c:1e:04:7e:3d:32:08:00 SRC=192.168.0.1 DST=224.0.0.1 LEN=32 TOS=0x00 PREC=0x00 TTL=1 ID=21310 PROTO=2
Apr 12 11:09:59 nori-hidamari kernel: [ 1371.882191] [UFW BLOCK] IN=wlan0 OUT= MAC=fc:f8:ae:3d:f9:b9:3c:1e:04:7e:3d:32:08:00 SRC=192.168.0.1 DST=224.0.0.1 LEN=32 TOS=0x00 PREC=0x00 TTL=1 ID=21856 PROTO=2
Apr 12 11:10:58 nori-hidamari kernel: [ 1431.752999] [UFW BLOCK] IN=wlan0 OUT= MAC=fc:f8:ae:3d:f9:b9:3c:1e:04:7e:3d:32:08:00 SRC=192.168.0.1 DST=224.0.0.1 LEN=32 TOS=0x00 PREC=0x00 TTL=1 ID=22388 PROTO=2
Apr 12 11:11:58 nori-hidamari kernel: [ 1491.624027] [UFW BLOCK] IN=wlan0 OUT= MAC=fc:f8:ae:3d:f9:b9:3c:1e:04:7e:3d:32:08:00 SRC=192.168.0.1 DST=224.0.0.1 LEN=32 TOS=0x00 PREC=0x00 TTL=1 ID=22798 PROTO=2
Apr 12 11:12:58 nori-hidamari kernel: [ 1551.442926] [UFW BLOCK] IN=wlan0 OUT= MAC=fc:f8:ae:3d:f9:b9:3c:1e:04:7e:3d:32:08:00 SRC=192.168.0.1 DST=224.0.0.1 LEN=32 TOS=0x00 PREC=0x00 TTL=1 ID=22838 PROTO=2
Apr 12 11:13:58 nori-hidamari kernel: [ 1611.367003] [UFW BLOCK] IN=wlan0 OUT= MAC=fc:f8:ae:3d:f9:b9:3c:1e:04:7e:3d:32:08:00 SRC=192.168.0.1 DST=224.0.0.1 LEN=32 TOS=0x00 PREC=0x00 TTL=1 ID=22860 PROTO=2
Apr 12 11:14:58 nori-hidamari kernel: [ 1671.238148] [UFW BLOCK] IN=wlan0 OUT= MAC=fc:f8:ae:3d:f9:b9:3c:1e:04:7e:3d:32:08:00 SRC=192.168.0.1 DST=224.0.0.1 LEN=32 TOS=0x00 PREC=0x00 TTL=1 ID=22862 PROTO=2
Ubuntu 14.04 也更新了。问题出在路由器还是操作系统？（我已经检查过我是网络中唯一的用户，但仍然收到 UFW 阻止，这真的很奇怪）
谢谢你们帮助我。
答案1
这些数据包是来自路由器本身的 igmp 数据包。
“Internet 组管理协议 (IGMP) 是 IPv4 网络上的主机和相邻路由器用来建立多播组成员资格的通信协议。IGMP 是 IP 多播的一个组成部分。”
我不使用 UFW，但在我的 iptables 规则集中我有一条规则来丢弃那些数据包而不进行记录，以避免我的日志文件混乱。