Date: Sat, 15 Sep 2007 13:07:20 +0800 From: "Ronnel P. Maglasang" <rmaglasang@infoweapons.com> To: myronn@seed.net.tw Cc: freebsd-net@freebsd.org Subject: Re: ICMP issue while multiple interface in the same subnet Message-ID: <46EB6888.2030407@infoweapons.com> In-Reply-To: <18389100.19191189762877349.JavaMail.root@wm8.seed.net.tw> References: <18389100.19191189762877349.JavaMail.root@wm8.seed.net.tw>
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what are the IP addresses of your nics in Host1 and Host2? they should be in different networks (e.g. 10/8 and 172.16/16) for this to work. myronn@seed.net.tw wrote: > Hi, > For a special test reason, I must use two hosts and it has two interfaces to connect each other without any switch or hub. > Host1 Host2 > |-----| |-----| > | 1 0-----------------0 1 | > | | | | > | 2 0-----------------0 2 | > |-----| |-----| > > Host platform OS is BSD. I assigned Host1 NIC1 ping Host NIC2. Command is correct but I found as follows: > 1. Host1 arp broadcast to Host2 and Host2 would be return info to Host1. > 2. Then, Host1 sent ICMP request packet to Host2. > 3. Host2 received packet and always "USE" NIC2 replaying the ICMP reply. > 4. If Host1 use NIC2 ping Host2 NIC2, Host1 NIC2 could get the ICMP reply packet from Host2 NIC2. > > Question: > 1. This behavior is a normal network behavior? > 2. If it's a normal network behavior, it followed which standard? > 3. I know that there were other softwares could change this behavior but why many platforms(BSD,Linux,.....) used this behavior was its default network behavior? > 4. Why default behavior is incoming interface different from outgoing interface? > 5. If I set all interfaces are in the same subnet and the incoming interface is the same with outgoing interface, what weakness would be happened? > > Thanks and Regards, > Myron > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" > >
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