tcpdump mailing list archives
Re: Capturing in 32 bit guests
From: Michael Richardson <mcr () sandelman ca>
Date: Wed, 01 Feb 2012 08:32:07 -0500
"Guy" == Guy Harris <guy () alum mit edu> writes:
Guy> On Jan 31, 2012, at 11:31 PM, Graeme Sheppard wrote: >> I have a problem capturing in a 32 bit guest on a 64 bit >> VZ/OpenVZ host. It worked in a 64 bit guest but I had to change >> to 32 (another story.) Guy> So the host on which you're capturing is running a 32-bit Linux Guy> kernel and a 32-bit version of tcpdump? No, openvz is a container, not a virtualization. So the kernel is 64-bit, the userland in a chroot/jail+++ is 32-bit. The kernel would be doing 32-bit emulation of many calls, but I'll bet things like the mmap() interface are 64-bit. Not using that interface (I'm actually not sure if we can turn it off if the kernel says it exists..) might help. It might also be the container-ized network interface code screwing it up, but I'd expect it to fail for the 64-bit "guest" as well. (talking about "guest" wrt openvz is probably a bad thing) -- ] He who is tired of Weird Al is tired of life! | firewalls [ ] Michael Richardson, Sandelman Software Works, Ottawa, ON |net architect[ ] mcr () sandelman ottawa on ca http://www.sandelman.ottawa.on.ca/ |device driver[ Kyoto Plus: watch the video <http://www.youtube.com/watch?v=kzx1ycLXQSE> then sign the petition. - This is the tcpdump-workers list. Visit https://cod.sandelman.ca/ to unsubscribe.
Current thread:
- Capturing in 32 bit guests Graeme Sheppard (Jan 31)
- Re: Capturing in 32 bit guests Guy Harris (Feb 01)
- Re: Capturing in 32 bit guests Guy Harris (Feb 01)
- Re: Capturing in 32 bit guests Michael Richardson (Feb 01)
- Re: Capturing in 32 bit guests Guy Harris (Feb 01)
- Re: Capturing in 32 bit guests Guy Harris (Feb 01)
- Re: Capturing in 32 bit guests Romain Francoise (Feb 02)
- Re: Capturing in 32 bit guests Guy Harris (Feb 01)