Anyway I can have the same MAC address for both boxes on eth0. On Sunday 21 May 2006 13:20, Martijn Lievaart wrote: > Antonio Di Bacco wrote: > >Anyone could explain this? > > > >Two linux systems connected: > > > >System A <=========> System B > > eth0 eth0 > > > >Each system ha the following config: > > > ># routing enabled > >net.ipv4.ip_forward=1 > > > >#ethernet with no address associated and NOARP set > >eth0 Link encap:Ethernet HWaddr 08:00:3E:26:24:65 > > UP BROADCAST RUNNING NOARP MULTICAST MTU:1500 Metric:1 > > RX packets:1306 errors:0 dropped:0 overruns:0 frame:0 > > TX packets:1325 errors:0 dropped:0 overruns:0 carrier:0 > > collisions:0 txqueuelen:1000 > > RX bytes:732864 (715.6 KiB) TX bytes:61643 (60.1 KiB) > > Base address:0x3c00 > > > ># Routing table > >Kernel IP routing table > >Destination Gateway Genmask Flags Metric Ref Use > > Iface 10.10.10.10 * 255.255.255.255 UH 0 0 > > 0 eth0 > > > > > >I'm on System A and try to ping 10.10.10.10 but no answer. Where is the > >problem? > > Which system has 10.10.10.10? None. So how can any system answer? Even > if there was a 10.10.10.10, you disabled the arp mechanism, so you can > never find out where it is. Finaly, for the return packets exactly the > same problem occurs. > > If you want to make a point to point connection over ethernet: > - Either just configure a subnet there. > - Or: > - Assign addresses to the interfaces (can be the same address as > another interface on the same box) > - Create static arp addresses for the other box > - Create routes as above for the address of the other box > > I think you will still have to enable arp for this to work, in which > case you can skip the static arp entries. > > HTH, > M4
