Networking

“目標主機無法訪問”並且 ARP 不返回 LAN 上的地址

  • April 8, 2014

我目前正在嘗試通過網路遮罩在兩台機器上設置 LAN,255.255.255.0但是當我嘗試在它們之間進行通信時收到以下消息;

[root@alpha ~]# ping 192.168.0.249
PING 192.168.0.249 (192.168.0.249) 56(84) bytes of data.
From 192.168.0.248 icmp_seq=2 Destination Host Unreachable
From 192.168.0.248 icmp_seq=3 Destination Host Unreachable
From 192.168.0.248 icmp_seq=4 Destination Host Unreachable
--- 192.168.0.249 ping statistics ---
6 packets transmitted, 0 received, +3 errors, 100% packet loss, time 5175ms

在另一台專用機器上也會發生這種情況。我對自己做錯了什麼一無所知,我已經多次重新啟動並重新啟動網路服務,但仍然沒有運氣。

從下面可以看出,ARP 不返回 LAN 地址,但它應該顯示這兩個地址。IPTables 已禁用,正常公共 IP 將允許 ping。

Dedi #1 的詳細資訊:

[root@alpha ~]# ifconfig eth0
eth0      Link encap:Ethernet  HWaddr 00:25:90:C8:81:4C
         inet addr:192.168.0.248  Bcast:192.168.0.255  Mask:255.255.255.0
         inet6 addr: fe80::225:90ff:fec8:814c/64 Scope:Link
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
         RX packets:3634 errors:0 dropped:0 overruns:0 frame:0
         TX packets:197 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:1000
         RX bytes:220672 (215.5 KiB)  TX bytes:10318 (10.0 KiB)
         Memory:f7180000-f7200000

[root@alpha ~]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
*.*.*.152       0.0.0.0         255.255.255.248 U     0      0        0 eth1
192.168.0.0     0.0.0.0         255.255.255.0   U     0      0        0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U     1002   0        0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U     1003   0        0 eth1
0.0.0.0         *.*.*.153       0.0.0.0         UG    0      0        0 eth1
[root@alpha ~]# arp -a
? (*.*.*.153) at 74:8e:f8:f7:98:58 [ether] on eth1

Dedi #2 的詳細資訊:

[root@beta network-scripts]# ifconfig eth0
eth0      Link encap:Ethernet  HWaddr 00:25:90:C5:C8:A0
         inet addr:192.168.0.249  Bcast:192.168.0.255  Mask:255.255.255.0
         inet6 addr: fe80::225:90ff:fec5:c8a0/64 Scope:Link
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
         RX packets:0 errors:0 dropped:0 overruns:0 frame:0
         TX packets:54 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:1000
         RX bytes:0 (0.0 b)  TX bytes:3576 (3.4 KiB)
         Memory:f7180000-f7200000

[root@beta network-scripts]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
*.*.*.128       0.0.0.0         255.255.255.248 U     0      0        0 eth1
192.168.0.0     0.0.0.0         255.255.255.0   U     0      0        0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U     1002   0        0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U     1003   0        0 eth1
0.0.0.0         *.*.*.129       0.0.0.0         UG    0      0        0 eth1
[root@beta network-scripts]# arp -a
? (*.*.*.129) at 74:8e:f8:fa:b9:8e [ether] on eth1

雖然我不能 100% 確定(您必須聯繫 SecureServers),但大多數託管公司將同一交換機上的伺服器與 VLAN 或 ACL 條目隔離開來。這樣,您的伺服器就無法看到彼此。

請聯繫您的託管公司以確定。他們很可能必須為您設置專用的“內部”網路,或者您需要使用 VPN 解決方案。

引用自:https://serverfault.com/questions/587460