我有一台配备 2 个 NIC 的服务器，每个 NIC 都配置在单独的子网上：
NIC1 xxx.xx.151.10, mask 255.255.252.0, gateway xxx.xx.148.1
NIC2 xxx.xx.148.10, mask 255.255.255.0, gateway None, but I tried setting same as NIC1 to see if it helped. Did not.
从服务器，当我 ping 148 子网上的设备（即 IP 打印机，甚至是网关）时，第一个请求总是以目标主机无法访问作为来自 NIC2 的回复返回。此后，其余请求均正常。同样，当我向 148 子网上的设备发送请求（在本例中为打印作业）时，第一次尝试非常慢，然后后续打印正常。如果我在约 15 秒内未向给定设备发送任何内容，它将恢复到原始状态。
151子网上有几台打印机没有这个问题。
那么，我该如何消除这种初始延迟呢？
附加信息：服务器：Windows Server 2008 R2
Pinging xxx.xx.148.1 with 32 bytes of data:
Reply from xxx.xx.148.10: Destination host unreachable.
Reply from xxx.xx.148.1: bytes=32 time=2ms TTL=64
Reply from xxx.xx.148.1: bytes=32 time=1ms TTL=64
Reply from xxx.xx.148.1: bytes=32 time=1ms TTL=64
Ping statistics for xxx.xx.148.1:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 1ms, Maximum = 2ms, Average = 1ms
netstat -rn：
IPv4 Route Table
===========================================================================
Active Routes:
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 xxx.xx.148.1 xxx.xx.151.10 266
127.0.0.0 255.0.0.0 On-link 127.0.0.1 306
127.0.0.1 255.255.255.255 On-link 127.0.0.1 306
127.255.255.255 255.255.255.255 On-link 127.0.0.1 306
xxx.xx.148.0 255.255.252.0 On-link xxx.xx.151.10 266
xxx.xx.148.0 255.255.255.0 On-link xxx.xx.148.10 266
xxx.xx.148.10 255.255.255.255 On-link xxx.xx.148.10 266
xxx.xx.148.255 255.255.255.255 On-link xxx.xx.148.10 266
xxx.xx.151.10 255.255.255.255 On-link xxx.xx.151.10 266
xxx.xx.151.255 255.255.255.255 On-link xxx.xx.151.10 266
192.168.1.0 255.255.255.0 On-link 192.168.1.2 266
192.168.1.2 255.255.255.255 On-link 192.168.1.2 266
192.168.1.255 255.255.255.255 On-link 192.168.1.2 266
224.0.0.0 240.0.0.0 On-link 127.0.0.1 306
224.0.0.0 240.0.0.0 On-link xxx.xx.151.10 266
224.0.0.0 240.0.0.0 On-link xxx.xx.148.10 266
224.0.0.0 240.0.0.0 On-link 192.168.1.2 266
255.255.255.255 255.255.255.255 On-link 127.0.0.1 306
255.255.255.255 255.255.255.255 On-link xxx.xx.151.10 266
255.255.255.255 255.255.255.255 On-link xxx.xx.148.10 266
255.255.255.255 255.255.255.255 On-link 192.168.1.2 266
===========================================================================
Persistent Routes:
Network Address Netmask Gateway Address Metric
0.0.0.0 0.0.0.0 xxx.xx.148.1 Default
0.0.0.0 0.0.0.0 xxx.xx.150.250 Default
===========================================================================
编辑于 2014 年 5 月 30 日 这是很久以前的事了，有些细节还不清楚，但我想在这里列出我的解决方案。最终，我们不得不将 148 子网上的打印机组移至（幸运的是未使用）150 子网。就像我说的，我不太记得确切的结论为什么发生了这种情况，但这与子网掩码和我们正在使用的子网有关，从而导致了冲突。