The 10GbE block is hard-coded with a subnet mask of 255.255.255.0. Anything outside of this subnet is routed through the gateway specified by you at configuration (so it is possible to route traffic to other subnets provided you have a correctly configured gateway).
With this subnet mask, we need an ARP table of 256 addresses which maps nicely into BRAM. It should be possible to modify the VHDL to support different subnet masks and you would then need to modify the tgtap driver too. This is not supported in the standard toolflow. Jason On 14 Oct 2010, at 06:24, Mark Wagner wrote: > Hi Billy, > > I'm not aware of the 10Gbe being specific to certain subnets. Are you sure > it's a generating packets issue and not a receiving packets? > > Have you tried looking for packets using something like wireshark or tcpdump? > > > Also, if you run ifconfig, what is your subnet mask set to? > > Mark > > > On Wed, Oct 13, 2010 at 6:23 PM, Barott, William Chauncey <[email protected]> > wrote: > Hi all, > > > I'm running version 7 of the toolflow compiling for BEE2s. Have run into a > difficulty with the 10Gbe yellow block. > > I can quite successfully generate packets within the same subnet - e.g. the > BEE2 on 10.4.0.100 and a receiver computer on 10.4.0.101. However, I've not > been successful in trying to generate packets outside of the /24 subnet. > With the same 10.4.0.100 BEE2 address, I cannot get packets delivered to > 10.5.0.101, for example (note the 4 changed to 5). I've not been able to > find a subnet configuration for the BEE2 10gbe block - maybe I've missed it, > nor have I found anything about such a limitation in the documentation. It > could also be a peculiarity of my network setup (though it's all quite out of > the box), but difficult to diagnose at this stage. > > > Has someone out there successfully done what I'm trying to do? Or know that > it's not possible? > > Any info is appreciated. Thanks! > > > Billy > > > > >
