Thanks, Gabe. I think I'm getting closer to getting it to work. I also needed to run the following: sudo ifconfig gem5-tap up sudo ifconfig gem5_bridge up
After that, I can see data arriving on gem5's EtherTap device. However, no data is arriving on the simulated Linux device. I think it's probably an issue with my setup (I have a static IP on the host). I'll keep digging and make sure to writeup a document with how to get this to work when I have it figured out. Cheers, Jason On Thu, Oct 12, 2017 at 5:11 PM Gabe Black <gabebl...@google.com> wrote: > Hi Jason. To get this to work, you can either use the little utility in > util/tap which will connect you sort of like wireshark using EtherTapStub, > or you can use the tup/tap interface directly using EtherTap. I've used the > later more or less successfully. It will (with default configuration) > create a tap device on your host called gem5-tap. Then you need to create a > bridge which will connect that device to a real device so that it can get > out onto the real network. Something like these commands will probably make > that happen: > > sudo ip link add name gem5_bridge type bridge > sudo ip link set eth0 master gem5_bridge > sudo tunctl -u `whoami` -g `whoami` -t gem5-tap > sudo ip link set gem5-tap master gem5_bridge > > You'll want to give up the IP assigned to your eth0, or otherwise things > get confused and your connection may drop. You should be able to do that > with these commands, although exactly what's happening is still a little > mysterious to me. I think the IP address is assumed by the bridge somehow > maybe? > > sudo ifconfig eth0 down > sudo ifconfig eth0 0.0.0.0 up > > You'll probably also want to stop dhcp from running on eth0 so it doesn't > get a new IP later on. > > Also, if you're going to be running multiple simulations bridged to the > network, you'll want to make sure you set the MAC address of each simulated > NIC to something unique. > > Gabe > > On Thu, Oct 12, 2017 at 4:25 PM, Jason Lowe-Power <ja...@lowepower.com> > wrote: > >> Hi all (and Gabe specifically), >> >> It sounds like you got the ethertap object to work, Gabe. ( >> https://gem5-review.googlesource.com/c/public/gem5/+/3646/4) >> >> What was necessary to do this? I *think* I have gem5 configured >> correctly, and I've created a tun device. However, the next step of somehow >> connecting the gem5 tap device to my "real" ethernet device is a mystery to >> me. >> >> If someone has a set of scripts or maybe just an example of how to get >> this feature to work, I'd really appreciate it. >> >> I would like to be able to use gem5 more like qemu. I.e., boot gem5 and >> then connect to the outside world to install new packages, etc. Is this >> possible with the tun/tap interface? >> >> Thanks, >> Jason >> > > _______________________________________________ gem5-dev mailing list gem5-dev@gem5.org http://m5sim.org/mailman/listinfo/gem5-dev
