To run a Linux PC as a router you need to enable ip forwarding (sysctl -w net.ipv4.ip_forward=1) and have two NICs with different subnets on each. If you want to emulate a WAN as a bridge, use Netem (a kernel 2.6 feature - see http://linux-net.osdl.org/index.php/Netem) with two NICs bridged. Jonathon.
________________________________ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Emin Gencpinar Sent: Thursday, 16 November 2006 8:57 a.m. To: nistnet@antd.nist.gov Subject: [nistnet] What does NISTNet as a router mean ? Hi all NISTNet users, " NIST Net is implemented as a kernel module extension to the Linux operating system and an X Window System-based user interface application. In use, the tool allows an inexpensive PC-based router to emulate numerous complex performance scenarios, including: tunable packet delay distributions, congestion and background loss, bandwidth limitation, and packet reordering / duplication. " We want to communicate two hosts at the same LAN :) but to emulate them as a WAN. They are at the same subnet like 192.168.X.X. Can the two hosts at the same subnet communicate by NISTNet ? As a router, what an extra configuration will we need ? We have two ethernet cards attached over our emulator machine, to effect traffic, to set packet delays... etc. with host1 from the eth0 and host2 from eth1 in this network. Do we need two ethernet cards like that for such an aim ? And what configuration do we need to success this with NISTNet ? We will use Gentoo Linux to successfully install NISTNet and use it as a module. As a last question; "Do these two commands help us to emulate our network ?" For emulating ("cnistnet up" at the beginning) cnistnet src dest --delay --bandwidth ... etc And watching what is going on at the background xnistnet And saying that the system is working well, :))) cnistnet -S src dest ... Thanks for all in advance... Need help as soon as possible :=) PLEASE NOTE: This email (including any attachments) is confidential, and may be protected by legal privilege and copyright. If you have received it in error please notify us immediately and delete it - it is unlawful to retain, print, distribute or reproduce it. We employ anti-virus software, but cannot guarantee emails are virus-free. Views expressed in this email may not be those of the originating organisation.
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