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Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!news.mel.connect.com.au!munnari.OZ.AU!spool.mu.edu!uwm.edu!math.ohio-state.edu!howland.erols.net!vixen.cso.uiuc.edu!sdd.hp.com!hp-pcd!hp-cv!reuter.cse.ogi.edu!ee.ogi.edu!not-for-mail From: pturner@ee.ogi.edu (Paul Turner) Newsgroups: comp.unix.bsd.bsdi.misc Subject: Can't get IP forwarding to work, need help Date: 13 Jan 1997 20:54:48 -0800 Organization: Oregon Graduate Institute, Dept. of Electrical Engineering Lines: 45 Message-ID: <5bf3io$sp@ee.ogi.edu> NNTP-Posting-Host: ee.ogi.edu Xref: euryale.cc.adfa.oz.au comp.unix.bsd.bsdi.misc:5554 Hi, We have 2 BSDI systems talking to each other via slip, the connection between the two works just fine, but I can't get the machine connected to our subnet to forward packets to the system on the other end of the connection. Given that sys1 is on a subnet of our LAN and sys2 is connected via slip to sys1, what is the magic need to make sys2 appear to be on the subnet of our LAN? I've tried 'arp -s sys2IP sys1Ether' to get sys1 to grab packets for sys2, but nothing happens. I've added a route on each machine that goes sys1 -> sys2 and sys2 -> sys1 - everything between the systems work just fine. Do I need to rebuild the kernel to turn on IP forwarding? I noticed that there is a line in rc.local that appears to be important: # to enable IP packet forwarding (routing): # echo -n "IP forwarding: "; sysctl -w net.inet.ip.forwarding=1 Does this need uncommenting? The kernel configuration for networking looks like: # network options options INET # Internet: TCP/IP # options GATEWAY # IP routing # options "IPFORWARDSRCRT=0" # disable forwarding of src-routed pkts # options NS # XNS # options ISO # ISO/OSI network options PPP # Point-to-Point Protocol # options CISCO_HDLC # HDLC over sync serial options MULTICAST # IP Multicast # options MROUTING # Multicast agent forwarding multicast Does the IP routing item need to be uncommented? Any help would be appreciated. Thanks, --Paul (pturner@ee.ogi.edu) -- Paul J Turner, Scientific Systems Administrator Department of Electrical Engineering OGI Email: pturner@ee.ogi.edu or pturner@teleport.com Office: (503) 690-1109 http://www.ee.ogi.edu/~pturner