我在芝加哥的一个数据中心有 4 台在 rocky linux 上运行的服务器，但其中一台没有响应 ping 请求。我已经检查了一天的解决方案，但到目前为止一切看起来都很好，我缺少什么？
[(01:51 PM)][(root@server)] [(~)] $ ip r
default via 208.117.37.129 dev enp68s0f0 proto static metric 100
208.117.37.129 dev enp68s0f0 proto static scope link metric 100
[(01:56 PM)][(root@server)] [(~)] $ ip addr show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: enp68s0f0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether 7c:c2:55:23:cd:3c brd ff:ff:ff:ff:ff:ff
inet 208.117.*.*/32 scope global noprefixroute enp68s0f0
valid_lft forever preferred_lft forever
inet6 fe80::7ec2:55ff:fe23:cd3c/64 scope link noprefixroute
valid_lft forever preferred_lft forever
3: enp68s0f1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether 7c:c2:55:23:cd:3d brd ff:ff:ff:ff:ff:ff
4: enp68s0f2: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
link/ether 7c:c2:55:23:cd:3e brd ff:ff:ff:ff:ff:ff
5: enp68s0f3: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
link/ether 7c:c2:55:23:cd:3f brd ff:ff:ff:ff:ff:ff
[(01:58 PM)][(root@server)] [(~)] $ ifconfig
enp68s0f0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 208.117.*.* netmask 255.255.255.255 broadcast 0.0.0.0
inet6 fe80::7ec2:55ff:fe23:cd3c prefixlen 64 scopeid 0x20<link>
ether 7c:c2:55:23:cd:3c txqueuelen 1000 (Ethernet)
RX packets 520286825 bytes 181418408778 (168.9 GiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 703930349 bytes 873242718055 (813.2 GiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
enp68s0f1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
ether 7c:c2:55:23:cd:3d txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 165 bytes 10362 (10.1 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
enp68s0f2: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
ether 7c:c2:55:23:cd:3e txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
[(01:59 PM)][(root@server)] [(~)] $ netstat -nr
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
0.0.0.0 208.117.37.129 0.0.0.0 UG 0 0 0 enp68s0f0
208.117.37.129 0.0.0.0 255.255.255.255 UH 0 0 0 enp68s0f0
[(01:59 PM)][(root@server)] [(~)] $ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: enp68s0f0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether 7c:c2:55:23:cd:3c brd ff:ff:ff:ff:ff:ff
inet 208.117.*.*/32 scope global noprefixroute enp68s0f0
valid_lft forever preferred_lft forever
inet6 fe80::7ec2:55ff:fe23:cd3c/64 scope link noprefixroute
valid_lft forever preferred_lft forever
3: enp68s0f1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether 7c:c2:55:23:cd:3d brd ff:ff:ff:ff:ff:ff
4: enp68s0f2: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
link/ether 7c:c2:55:23:cd:3e brd ff:ff:ff:ff:ff:ff
5: enp68s0f3: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
link/ether 7c:c2:55:23:cd:3f brd ff:ff:ff:ff:ff:ff
[(02:00 PM)][(root@server)] [(~)] $ cat /proc/sys/net/ipv4/icmp_echo_ignore_all
0