[网络]局域网为什么PING网关延迟高？

1、排除了线路问题，因为我在机房网线不超过5米，也有3MS，有时还突然很高。
Pinging 192.168.1.1 with 32 bytes of data:

Reply from 192.168.1.1: bytes=32 time=3ms TTL=255
Reply from 192.168.1.1: bytes=32 time=3ms TTL=255
Reply from 192.168.1.1: bytes=32 time=3ms TTL=255
Reply from 192.168.1.1: bytes=32 time=3ms TTL=255
Reply from 192.168.1.1: bytes=32 time=3ms TTL=255
Reply from 192.168.1.1: bytes=32 time=3ms TTL=255
Reply from 192.168.1.1: bytes=32 time=3ms TTL=255
Reply from 192.168.1.1: bytes=32 time=3ms TTL=255
Reply from 192.168.1.1: bytes=32 time=3ms TTL=255
Reply from 192.168.1.1: bytes=32 time=3ms TTL=255
Reply from 192.168.1.1: bytes=32 time=3ms TTL=255
Reply from 192.168.1.1: bytes=32 time=3ms TTL=255
Reply from 192.168.1.1: bytes=32 time=3ms TTL=255
Reply from 192.168.1.1: bytes=32 time=92ms TTL=255

2、连接局域网其他的终端延迟正常。
Pinging 192.168.1.87 with 32 bytes of data:

Reply from 192.168.1.87: bytes=32 time<1ms TTL=64
Reply from 192.168.1.87: bytes=32 time<1ms TTL=64
Reply from 192.168.1.87: bytes=32 time<1ms TTL=64
Reply from 192.168.1.87: bytes=32 time<1ms TTL=64
Reply from 192.168.1.87: bytes=32 time<1ms TTL=64
Reply from 192.168.1.87: bytes=32 time<1ms TTL=64
Reply from 192.168.1.87: bytes=32 time<1ms TTL=64
Reply from 192.168.1.87: bytes=32 time<1ms TTL=64
Reply from 192.168.1.87: bytes=32 time<1ms TTL=64
Reply from 192.168.1.87: bytes=32 time<1ms TTL=64
Reply from 192.168.1.87: bytes=32 time<1ms TTL=64
Reply from 192.168.1.87: bytes=32 time<1ms TTL=64
Reply from 192.168.1.87: bytes=32 time<1ms TTL=64