>>570　>>571　様

Ping結果です
C:\WINDOMS> ping yahoo.co.jp
Pinging yahoo.co.jp［203.141.35.113］with 32bytes of data:
Reply from 203.141.35.113　bytes=32 tlme=25ms TTL=245
Reply from 203.141.35.113　bytes=32 tlme=23ms TTL=245
Reply from 203.141.35.113　bytes=32 tlme=24ms TTL=245
Reply from 203.141.35.113　bytes=32 tlme=24ms TTL=245
Ping statistics for 203.141.35.113:
　　Packets: Sent = 4, Received = 4, Lost = 0 (0%loss),
Approximate round trip timesin milli-Seconds:
　　Minimum = 23ms, Maximum = 25ms, Average = 24ms

C:\WINDOWS> ping211.14.15.5
Pinging211.14.15.5 with 32bytes of data：
Reply from211.14.15.5：bytes=32 time=24ms TTL=245
Reply from211.14.15.5：bytes=32 time=23ms TTL=245
Reply from211.14.15.5：bytes=32 time=32ms TTL=245
Reply from211.14.15.5：bytes=32 time=24ms TTL=245
Ping statistics for211.14.15.5:
　Packets：Sent:4, Received:4, Lost:0 (0％loss),
Approximate round trip timesin milli-Seconds:
　　Minimum = 23ms, Maximum = 32ms, Average = 25ms

ちなみにIEではDNSエラーになります・・・
IPはすべて自動（DHCPはルータ）、ただし複合機（スキャナプリンタ）は手動固定です。