Date: Fri, 24 Aug 2007 14:46:20 +0800 (CST) From: myronn@seed.net.tw To: freebsd-questions@FreeBSD.org Subject: [multiple NIC issue] two NICs in the same subnet problem. Message-ID: <11635695.14361187937980559.JavaMail.root@wm7.seed.net.tw>
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Hi,
I found an issue for a long time.
For test requirement without any switch/hub:
One host has two NICs and with the same subnet setting.
(local)NIC1: 10.0.0.1/8
(local)NIC2: 10.0.0.2/8
(direct connect peer) 10.0.0.10/8
(direct connect peer) 10.0.0.20/8
ping command: #ping 10.0.0.10 -c 5 -S 10.0.0.1
In Linux, while I assign source interface and IP address,
ex. ping 10.0.0.10 -I eth0 ......packet will be sent by NIC1
ping 10.0.0.20 -I eth1 ......packet will be sent by NIC2
In BSD, while I assign source interface/IP address, packet always
be sent by NIC1. The NIC2 looks like dead. Until I set
"#ifconfig eth0 down" and NIC2 would be got up.
So the ping command parameter "-S" would be broke down in this case.
The packets format maybe is correct but NIC2 couldn't work.
If this is NOT a BUG, please tell me BSD is followed which standard?
Or what the purpose of BSD to define this behavior?
Thanks & Regards
Myron
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