From owner-freebsd-questions Fri Feb 26 15:48:28 1999 Delivered-To: freebsd-questions@freebsd.org Received: from caladan.tdx.co.uk (caladan.tdx.co.uk [195.188.177.4]) by hub.freebsd.org (Postfix) with ESMTP id 270031505C for ; Fri, 26 Feb 1999 15:48:14 -0800 (PST) (envelope-from kpielorz@caladan.tdx.co.uk) Received: from localhost (kpielorz@localhost) by caladan.tdx.co.uk (8.9.3/8.9.3) with ESMTP id XAA65637; Fri, 26 Feb 1999 23:46:39 GMT Date: Fri, 26 Feb 1999 23:46:38 +0000 (GMT) From: Karl Pielorz To: "Victor M. Carranza G." Cc: FreeBSD Questions mailing list Subject: Re: Preventing stealing of IP address... In-Reply-To: Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Fri, 26 Feb 1999, Victor M. Carranza G. wrote: > Hi! > > What can I do to prevent my FreeBSD server's IP address from being > "stealed" by a misconfigured network client? I mean... when somebody in > the same network configures her machine with the same address as the > FreeBSD server, the server losts access to the network until the client > releases the address! There used to be a term for this - called "Arp Wars" (as both systems will send ARP replies - claiming themselves as the owner of the IP) , there's not a lot you can do to prevent it... In reality, if the other machine is a MS machine (i.e. 95/98 etc.) it will back-down and display an error to the user... It then usally disables it's network stack, the FreeBSD box will usually recover after the ARP's have timed out... (at least this is what we've found). At the end of the day, there is no easy way to prevent this AFAIK. -Kp To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message