Date: Mon, 27 Mar 2000 22:53:09 -0600 From: "Jim King" <king@sstar.com> To: "Cy Schubert - ITSD Open Systems Group" <Cy.Schubert@uumail.gov.bc.ca>, "David Gilbert" <dgilbert@velocet.ca> Cc: <freebsd-stable@FreeBSD.ORG> Subject: Re: 4.0-STABLE dhcp conflicts. Message-ID: <004f01bf9871$848e7c00$08e48486@marble> References: <200003280440.UAA07738@cwsys.cwsent.com>
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On Monday, March 27, 2000 10:40 PM, Cy Schubert - ITSD Open Systems Group wrote: > n message <14559.40450.544687.51037@trooper.velocet.net>, David Gilbert > writes > : > > It appears that when I run two (not sure if one does it) tcpdumps on > > the dhcp server, the dhcp clients don't get any responses to their > > queries. Is there some flaw in the dhcpd bpf rules? > > I suspect that the dhcp server set the interface to promiscuous mode so > it can listen for broadcasts. Tcpdump sets up an interface for > promiscuous opertion and when you exit tcpdump it returns it to > non-promiscuous operation. Killing and restarting your dhcp server > after exiting tcpdump should solve your problem, as it will set the > interface up for promiscuous operation again. I regularly run (and exit) tcpdump and it doesn't affect my DHCP server (isc-dhcp2). dhcpd keeps on handing out leases after tcpdump has exited. syslog has "promiscuous mode enabled" and "promiscuous mode disabled" when I start and exit tcpdump, which is a bit confusing. I'm guessing that promiscuous mode is on the entire time and the messages really mean something like "promiscuous mode reference count incremented/decremented". Jim To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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