2012/8/22 Les Mikesell <lesmikesell at gmail.com> > On Wed, Aug 22, 2012 at 8:01 AM, Richard Reina <gatorreina at gmail.com> > wrote: > > I have a simple perl script that every few hours pings the handful of > > machines on my LAN. Lately I've sometimes been getting > > > > ping of 192.168.0.1 succeeded > > ping of 192.168.0.7 succeeded > > ping of 192.168.0.5 FAILED > > ping of 192.168.0.6 succeeded > > ping of 192.168.0.9 succeeded > > > > This machine in question has been running Centos faithfully for about > six > > years and no recent changes to it have been made. When I try and ping the > > machine manually it works. /var/og/messages does not seem irregular. > Does > > anyone know know what might be the problem or what else I might check? > > > > What does ethtool say about your duplex setting Here is the output from ethtool Settings for eth0: Supported ports: [ TP MII ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full Supports auto-negotiation: Yes Advertised link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full Advertised auto-negotiation: Yes Speed: 100Mb/s Duplex: Full Port: MII PHYAD: 1 Transceiver: internal Auto-negotiation: on Supports Wake-on: g Wake-on: g Current message level: 0x00000007 (7) Link detected: yes THe switch is a linksys etherfast 3124 that has worked perfectly for 10 years. I don't know anything about it's settings. This is a LAN with about a dozen machines. Thanks