这也发布在Apple 的支持论坛。
我发现了多个类似的问题,但没有一个能帮助我。
我有一个家庭网络,其中有 2 台机器连接到 Wi-Fi 路由器。从 A 到 B 的 Ping 因超时而失败。tcpdump
显示机器 B 确实看到了传入的请求。从 B 到 A 的 Ping 成功。两台机器都运行 Mac OS,防火墙已禁用,尝试使用我的 Android 手机的热点 Wi-Fi 连接它们,结果相同。
我想通过远程桌面将我的笔记本电脑(MacBook)连接到固定电脑(Mac mini)。
路由器
- 型号 =Inteno DG400 Prime
- IP =
192.168.1.1
- AP 隔离 = 关闭
MacBook
操作系统 = Catalina 10.15.6
IP =
192.168.1.231
防火墙:关闭
ping
适用于:,,localhost
(路由器),(本身)127.0.0.1
192.168.1.1
192.168.1.231
ping
超时:192.168.1.185
(mac mini)nslookup sams-mac-mini
成功解析为192.168.1.185
netstat -rn
:
Routing tables
Internet:
Destination Gateway Flags Netif Expire
default 192.168.1.1 UGSc en0
127 127.0.0.1 UCS lo0
127.0.0.1 127.0.0.1 UH lo0
169.254 link#6 UCS en0 !
192.168.1 link#6 UCS en0 !
192.168.1.1/32 link#6 UCS en0 !
192.168.1.1 20:1f:31:aa:e5:90 UHLWIir en0 1190
192.168.1.185 3c:22:fb:a8:43:ed UHLWI en0 902
192.168.1.231/32 link#6 UCS en0 !
224.0.0/4 link#6 UmCS en0 !
224.0.0.251 1:0:5e:0:0:fb UHmLWI en0
239.192.152.143 1:0:5e:40:98:8f UHmLWI en0
239.255.255.250 1:0:5e:7f:ff:fa UHmLWI en0
255.255.255.255/32 link#6 UCS en0 !
Internet6:
Destination Gateway Flags Netif Expire
default fe80::221f:31ff:feaa:e590%en0 UGc en0
default fe80::%utun0 UGcI utun0
default fe80::%utun1 UGcI utun1
default fe80::%utun2 UGcI utun2
default fe80::%utun3 UGcI utun3
::1 ::1 UHL lo0
2001:7d0:84b0:1580::/64 link#6 UC en0
2001:7d0:84b0:1580:4bf:ddc7:25f2:30f1 3c:22:fb:40:fd:5d UHL lo0
2001:7d0:84b0:1580:7c49:fd29:22b:1ea2 3c:22:fb:a8:43:ed UHLWIi en0
2001:7d0:84b0:1580:817a:55f7:e052:2518 link#6 UHLWI en0
2001:7d0:84b0:1580:bd28:6e56:8081:20c1 3c:22:fb:40:fd:5d UHL lo0
fe80::%lo0/64 fe80::1%lo0 UcI lo0
fe80::1%lo0 link#1 UHLI lo0
fe80::%en5/64 link#4 UCI en5
fe80::aede:48ff:fe00:1122%en5 ac:de:48:0:11:22 UHLI lo0
fe80::aede:48ff:fe33:4455%en5 ac:de:48:33:44:55 UHLWIi en5
fe80::%en0/64 link#6 UCI en0
fe80::c3d:9dc9:9593:12c8%en0 3c:22:fb:40:fd:5d UHLI lo0
fe80::1477:d6f9:e406:2a44%en0 3c:22:fb:a8:43:ed UHLWI en0
fe80::1826:bd30:ffca:e2af%en0 88:a9:b7:65:a0:4b UHLWI en0
fe80::221f:31ff:feaa:e590%en0 20:1f:31:aa:e5:90 UHLWIir en0
fe80::%awdl0/64 link#13 UCI awdl0
fe80::44ad:a1ff:febb:3021%awdl0 46:ad:a1:bb:30:21 UHLWIi awdl0
fe80::a861:11ff:fea8:3756%awdl0 aa:61:11:a8:37:56 UHLI lo0
fe80::%llw0/64 link#14 UCI llw0
fe80::44ad:a1ff:febb:3021%llw0 46:ad:a1:bb:30:21 UHLWI llw0
fe80::a861:11ff:fea8:3756%llw0 aa:61:11:a8:37:56 UHLI lo0
fe80::%utun0/64 fe80::e39:7f8:b2fb:4473%utun0 UcI utun0
fe80::e39:7f8:b2fb:4473%utun0 link#15 UHLI lo0
fe80::%utun1/64 fe80::245e:5d7e:31eb:6ac6%utun1 UcI utun1
fe80::245e:5d7e:31eb:6ac6%utun1 link#16 UHLI lo0
fe80::%utun2/64 fe80::4175:99b7:91f2:1a2e%utun2 UcI utun2
fe80::4175:99b7:91f2:1a2e%utun2 link#17 UHLI lo0
fe80::%utun3/64 fe80::19bd:c7d7:c780:8e80%utun3 UcI utun3
fe80::19bd:c7d7:c780:8e80%utun3 link#18 UHLI lo0
ff01::%lo0/32 ::1 UmCI lo0
ff01::%en5/32 link#4 UmCI en5
ff01::%en0/32 link#6 UmCI en0
ff01::%awdl0/32 link#13 UmCI awdl0
ff01::%llw0/32 link#14 UmCI llw0
ff01::%utun0/32 fe80::e39:7f8:b2fb:4473%utun0 UmCI utun0
ff01::%utun1/32 fe80::245e:5d7e:31eb:6ac6%utun1 UmCI utun1
ff01::%utun2/32 fe80::4175:99b7:91f2:1a2e%utun2 UmCI utun2
ff01::%utun3/32 fe80::19bd:c7d7:c780:8e80%utun3 UmCI utun3
ff02::%lo0/32 ::1 UmCI lo0
ff02::%en5/32 link#4 UmCI en5
ff02::%en0/32 link#6 UmCI en0
ff02::%awdl0/32 link#13 UmCI awdl0
ff02::%llw0/32 link#14 UmCI llw0
ff02::%utun0/32 fe80::e39:7f8:b2fb:4473%utun0 UmCI utun0
ff02::%utun1/32 fe80::245e:5d7e:31eb:6ac6%utun1 UmCI utun1
ff02::%utun2/32 fe80::4175:99b7:91f2:1a2e%utun2 UmCI utun2
ff02::%utun3/32 fe80::19bd:c7d7:c780:8e80%utun3 UmCI utun3
迷你苹果电脑
操作系统 = Catalina 10.15.6
IP =
192.168.1.185
防火墙:关闭
ping
适用于:、、localhost
(路由器)、(本身)、(MacBook)127.0.0.1
192.168.1.1
192.168.1.185
192.168.1.231
nslookup sams-mbp
成功解析为192.168.1.231
注意:我确实安装了 VPN,但目前尚未连接/使用,因此您可能会在这里看到与此相关的内容。
netstat -rn
:
Routing tables
Internet:
Destination Gateway Flags Netif Expire
default 192.168.1.1 UGSc en1
127 127.0.0.1 UCS lo0
127.0.0.1 127.0.0.1 UH lo0
169.254 link#7 UCS en1 !
192.168.1 link#7 UCS en1 !
192.168.1.1/32 link#7 UCS en1 !
192.168.1.1 20:1f:31:aa:e5:90 UHLWIir en1 1196
192.168.1.185/32 link#7 UCS en1 !
192.168.1.255 ff:ff:ff:ff:ff:ff UHLWbI en1 !
224.0.0/4 link#7 UmCS en1 !
224.0.0.251 1:0:5e:0:0:fb UHmLWI en1
239.255.255.250 1:0:5e:7f:ff:fa UHmLWI en1
255.255.255.255/32 link#7 UCS en1 !
Internet6:
Destination Gateway Flags Netif Expire
default fe80::221f:31ff:feaa:e590%en1 UGc en1
default fe80::%utun0 UGcI utun0
default fe80::%utun1 UGcI utun1
default fe80::%utun2 UGcI utun2
default fe80::%utun3 UGcI utun3
::1 ::1 UHL lo0
2001:7d0:84b0:1580::/64 link#7 UC en1
2001:7d0:84b0:1580:1c09:ef76:fc0f:6787 3c:22:fb:a8:43:ed UHL lo0
2001:7d0:84b0:1580:409c:597b:219b:31cd 3c:22:fb:a8:43:ed UHL lo0
2001:7d0:84b0:1580:8d39:c6a:9520:65a8 link#7 UHLWI en1
fe80::%lo0/64 fe80::1%lo0 UcI lo0
fe80::1%lo0 link#1 UHLI lo0
fe80::%en6/64 link#5 UCI en6
fe80::aede:48ff:fe00:1122%en6 ac:de:48:0:11:22 UHLI lo0
fe80::aede:48ff:fe33:4455%en6 ac:de:48:33:44:55 UHLWIi en6
fe80::%en1/64 link#7 UCI en1
fe80::1477:d6f9:e406:2a44%en1 3c:22:fb:a8:43:ed UHLI lo0
fe80::221f:31ff:feaa:e590%en1 20:1f:31:aa:e5:90 UHLWIir en1
fe80::%awdl0/64 link#9 UCI awdl0
fe80::5892:a4ff:fe11:f46c%awdl0 5a:92:a4:11:f4:6c UHLI lo0
fe80::a861:11ff:fea8:3756%awdl0 aa:61:11:a8:37:56 UHLWIi awdl0
fe80::%llw0/64 link#10 UCI llw0
fe80::5892:a4ff:fe11:f46c%llw0 5a:92:a4:11:f4:6c UHLI lo0
fe80::a861:11ff:fea8:3756%llw0 aa:61:11:a8:37:56 UHLWI llw0
fe80::%utun0/64 fe80::35c8:509b:4d5f:e060%utun0 UcI utun0
fe80::35c8:509b:4d5f:e060%utun0 link#16 UHLI lo0
fe80::%utun1/64 fe80::f4f5:d2b6:c69e:755e%utun1 UcI utun1
fe80::f4f5:d2b6:c69e:755e%utun1 link#17 UHLI lo0
fe80::%utun2/64 fe80::19c4:e545:e84:a3bc%utun2 UcI utun2
fe80::19c4:e545:e84:a3bc%utun2 link#18 UHLI lo0
fe80::%utun3/64 fe80::f9fd:1490:c5f0:37ef%utun3 UcI utun3
fe80::f9fd:1490:c5f0:37ef%utun3 link#20 UHLI lo0
ff01::%lo0/32 ::1 UmCI lo0
ff01::%en0/32 link#4 UmCI en0
ff01::%en6/32 link#5 UmCI en6
ff01::%en1/32 link#7 UmCI en1
ff01::%awdl0/32 link#9 UmCI awdl0
ff01::%llw0/32 link#10 UmCI llw0
ff01::%utun0/32 fe80::35c8:509b:4d5f:e060%utun0 UmCI utun0
ff01::%utun1/32 fe80::f4f5:d2b6:c69e:755e%utun1 UmCI utun1
ff01::%utun2/32 fe80::19c4:e545:e84:a3bc%utun2 UmCI utun2
ff01::%utun3/32 fe80::f9fd:1490:c5f0:37ef%utun3 UmCI utun3
ff02::%lo0/32 ::1 UmCI lo0
ff02::%en0/32 link#4 UmCI en0
ff02::%en6/32 link#5 UmCI en6
ff02::%en1/32 link#7 UmCI en1
ff02::%awdl0/32 link#9 UmCI awdl0
ff02::%llw0/32 link#10 UmCI llw0
ff02::%utun0/32 fe80::35c8:509b:4d5f:e060%utun0 UmCI utun0
ff02::%utun1/32 fe80::f4f5:d2b6:c69e:755e%utun1 UmCI utun1
ff02::%utun2/32 fe80::19c4:e545:e84:a3bc%utun2 UmCI utun2
ff02::%utun3/32 fe80::f9fd:1490:c5f0:37ef%utun3 UmCI utun3
测试
在 Mac mini 上监听 ping 请求:
tcpdump -v host 192.168.1.231
在 Mac mini 上运行ping -c 4 192.168.1.185
在 MacBook 上运行Mac mini 输出:
tcpdump: data link type PKTAP tcpdump: listening on pktap, link-type PKTAP (Apple DLT_PKTAP), capture size 262144 bytes 11:43:05.797487 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 192.168.1.185 tell 192.168.1.231, length 28 11:43:05.797555 ARP, Ethernet (len 6), IPv4 (len 4), Reply 192.168.1.185 is-at 3c:22:fb:a8:43:ed (oui Unknown), length 28 11:43:05.814090 IP (tos 0x0, ttl 64, id 4572, offset 0, flags [none], proto ICMP (1), length 84) 192.168.1.231 > 192.168.1.185: ICMP echo request, id 40459, seq 0, length 64 11:43:06.734317 IP (tos 0x0, ttl 64, id 42401, offset 0, flags [none], proto ICMP (1), length 84) 192.168.1.231 > 192.168.1.185: ICMP echo request, id 40459, seq 1, length 64 11:43:07.722478 IP (tos 0x0, ttl 64, id 36241, offset 0, flags [none], proto ICMP (1), length 84) 192.168.1.231 > 192.168.1.185: ICMP echo request, id 40459, seq 2, length 64 11:43:08.726554 IP (tos 0x0, ttl 64, id 59095, offset 0, flags [none], proto ICMP (1), length 84) 192.168.1.231 > 192.168.1.185: ICMP echo request, id 40459, seq 3, length 64
MacBook 没有收到任何响应,所有 4 个请求都超时了,但正如您所见,mac mini 收到了所有请求,甚至似乎响应了 ARP,但 ICMP 没有响应。
禁用 IPv6
这让我想到这可能是由 Ipv6 引起的,所以我networksetup -setv6off Wi-Fi
在两台机器上运行,没有引起任何变化,所以我重新启用了它。
为 Mac mini 设置手动 IP
这建议如果我将 mac mini 的 IP 设置为 DHCP 池中的其他 IP,它可能会执行某些操作,但没有执行(我试过了192.168.1.230
)192.168.1.232
,所以我将自动地址放回去。
禁用其他网络接口
反向路径过滤器看起来和我所拥有的非常接近,但它是关于 Linux 的,Mac OS 对此有不同的处理。我没有花太多时间在这上面,但我认为这与机器与网络接口混淆有关,所以我禁用了除 Mac Mini 之外的所有接口,192.168.*
但这并没有解决问题。
尝试不同的路由器
我尝试将 MacBook 和 Mac Mini 连接到我的 Android 手机的 Wi-Fi 热点,但情况是一样的。
通过电缆连接
我尝试通过以太网电缆将 Mac Mini 直接连接到路由器,但没有任何变化。
希望我们能够找到解决方案,甚至将来能够帮助到其他人。
答案1
找到了!根本原因是 /Library/Extensions/cpfw.kext
我的 VPN 软件 (Endpoint Security VPN) 添加的扩展。一旦我从该文件夹中删除它,ping 就会再次开始工作!
事实证明这个文件是某种防火墙,即使没有它,VPN 也可以工作。
有关更多故障排除详细信息,请参阅Apple 论坛中的帖子。