From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bob Wirka Subject: Re: NFS and Network Driver Question Date: Thu, 21 Oct 2004 10:09:09 -0500 Sender: netdev-bounce@oss.sgi.com Message-ID: <4177D115.5070205@rtcworks.com> References: <41704198.8000206@rtcworks.com> <4175AEFE.7090002@rtcworks.com> <41768B15.1090402@osdl.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: netdev@oss.sgi.com, linux-net@vger.kernel.org Return-path: To: Stephen Hemminger In-Reply-To: <41768B15.1090402@osdl.org> Errors-to: netdev-bounce@oss.sgi.com List-Id: netdev.vger.kernel.org Here is another wrinkle: The program on my embedded system cannot send UDP broadcast messages when NFS mounted. When the system is booted without NFS (using the DiskOnChip for root file system) I can send UDP broadcasts. When the system is booted with NFS (using my laptop for root file system) UDP broadcasts result in "Network unreachable" errors, though it CAN send directed UDP messages and TCP messages. The kernel configuration is identical, except for kernel IP autoconfiguration, root over nfs, and compiled-in network driver. The NFS configuration on the host has 'no_root_squash', and <> all the files on the host root file system are owned by root. Any ideas? Thanks, Bob Wirka Realtime Control Works Stephen Hemminger wrote: > Bob Wirka wrote: > >> Ok, now I feel like I'm taking crazy pills... >> >> The embedded system boots up and mounts the root file system on my >> host laptop. The 'rc.sysinit' startup script executes the command >> 'mount -a' which should mount /proc, /dev/pts, and /dev/shm, as >> listed in /etc/fstab. When executed, that command returns "mount: >> only root can do that". >> >> When I get to the bash prompt, 'whoami' reports that I am, indeed, >> root. A 'mount -a' from the command prompt gives the same result; it >> doesn't think I'm root for the mount command. >> >> I can chown a file owned by root to some other user, and I can create >> a file or directory in a directory owned by root; so it doesn't >> always think I'm not root. >> > Are you getting bit by the nfs uid mapping on the server. Is it > mapping your local "root" to "nobody" > on the server? >