Make sure you are doing this on machine C: echo "Turning on IP forwarding" echo "1" > /proc/sys/net/ipv4/ip_forward That turns on the routing code on machine C. - Greg Scott -----Original Message----- From: Ali badilli [mailto:hasanoglu69@yahoo.com] Sent: Saturday, January 19, 2002 4:50 PM To: lartc@mailman.ds9a.nl Subject: [LARTC] A basic setup question Hi, I have just started to build a small linux network. I have the following question. If anybody helps I will be really appreciated. I have installed linux 7.2 in machine A, B, C and connected them as follows. A-----------C----------B eth0 eth0 eth1 eth0 As it is shown in figure C has two ethernet interfaces eth0 connected to A and eth1 connected to B. I have assigned the addresses as follows: A: 192.20.1.3 (eth0) mask:255.255.255.0 default gw:192.20.1.1 B: 192.20.2.3 (eth0) mask:255.255.255.0 default gw:192.20.2.1 C: 192.20.1.1 (eth0) mask:255.255.255.0 default gw:192.20.2.1 and 192.20.2.1 (eth1) mask:255.255.255.0 default gw:192.20.1.1 C acts as gateway between between A and B. I configure routing table as follows: A: destination network network mask gateway 0.0.0.0 0.0.0.0 92.20.1.1 192.20.1.0 255.255.255.0 192.20.1.3 B:destination network network mask gateway 0.0.0.0 0.0.0.0 92.20.2.1 192.20.2.0 255.255.255.0 192.20.2.3 C:destination network network mask gateway 192.20.2.0 255.255.255.0 192.20.2.1 (eth0) 192.20.1.0 255.255.255.0 192.20.1.1 (eth1) I can ping from A to 192.20.2.1 but I cannot ping to 192.20.2.3(which is B) similarly, I can ping from B to 192.20.1.1 but cannot ping to 192.20.1.3 (which is A). In other word, Both A and B can ping the interfaces of C which belong to different subnets, but A and B cannot ping each other. Am I missing some basic configuration things?, Should I install any other patch or etc?, I will be really appreciated If some body give me clear explanation. Sorry for asking a simple question. Haci __________________________________________________ Do You Yahoo!? Send FREE video emails in Yahoo! Mail! http://promo.yahoo.com/videomail/ _______________________________________________ LARTC mailing list / LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://ds9a.nl/lartc/
