Date: Thu, 1 Apr 2010 13:21:00 -0500 From: Peter Steele <psteele@maxiscale.com> To: "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org> Subject: Testing ethernet interface status Message-ID: <7B9397B189EB6E46A5EE7B4C8A4BB7CB3B65FC5D@MBX03.exg5.exghost.com>
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What's the best what to test the status of an Ethernet interface programmat= ically? We've been using this code similar to this: struct ifmediareq ifmr; memset(&ifmr, 0, sizeof(ifmr)); strcpy(ifmr.ifm_name, "nfe0"); ioctl(sockfd, SIOCGIFMEDIA, (caddr_t)&ifmr) and then checking the value of ifmr.ifm_status & IFM_ACTIVE. We've found th= at every once in a while this code will return a false positive, indicating= that the interface has gone offline when in fact it has not. So, is there a more reliable call to test if an Ethernet interface has gone= offline?
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