I am using a Centos 5.5 box. Something on the network is advertising IPv6 prefixes, and I want to know who.
One solution would be to install tcpdump or tshark and just look at the network traffic. I would prefer not to have to rewire the network or play rpm sherpa with scp.
Is there a utility, like route or ip that will show me the addresses of the routers sending the advertisements?
I installed Centos 5.5 on a headless server. The BIOS supports console redirection, so all I needed to do was: 1) Connect over a serial cable, 2) adjust the BIOS, 3) put the CD in, and 4) at the boot prompt, type:
linux console=ttyS0,115200n8
On Ubuntu 10.10, I tried the same technique. Even before the boot: prompt, I received an error message:
graphics initialization failed
Error setting up gfxboot
boot:
and when I tried to the same command as on Centos, I received the error:
Could not find kernel image: linux
I then looked at the isolinux directory on the CD, and all the boot menus had something like /install/vmlinuz, so I tried:
/install/vmlinuz console=ttyS0,115200n8
But that fails with a kernel panic
[ 3.271958] Kernel panic - not syncing: VFS: Unable to mount root fs on unknow
n-block(104,1)
[ 3.280699] Pid: 1, comm: swapper Not tainted 2.6.35-22-generic #33-Ubuntu
Farther up the console output, I saw the error:
[ 3.185400] VFS: Cannot open root device "(null)" or unknown-block(104,1)
[ 3.192380] Please append a correct "root=" boot option; here are the availab
le partitions:
I'm going to keep trying, but I would welcome any advice on how to get Ubuntu 10.10 installed on my headless server.
I am using a rack mounted device that has 10 Ethernet ports built into it. For 8 of the ports, I would like to bind them to a single vwmare-server-2.0 virtual network interface, so that I can, in effect, use the ports as a hub for the external devices and internal virtual machines.
How can I bridge a single vmware vmnet# interface to several physical interfaces?
How can I test passwords against a dictionary / word list, where the entries have been fuzzed to some degree?
By "fuzzed", I mean variants of words with "l33t" conversions and other character conversions are included in the check.
Ideally, I would like to pass in a password value, have the utility check the password, and return a yes/no value.
I've been catching up on my security podcast backlog, and I've been hearing about cloudburst attacks on virtual machines. While Google returns info about the Black Hat related press releases, I can't find info about how to defend against this attack.
How does one defend against the cloudburst, and similar, attacks?
I am expanding my rescue usb flash disk. The USB's partition is bootable, and I have installed GRUB to the MBR of the jump drive. It works pretty well - I can boot Freedos and run some utilities,and I can boot PING.
I would like to add the Ubuntu 9.10 LiveCD to this rescue usb drive. I have a working jumpdrive, so I can pretty easily copy over the files. I could hunt down the needed menu.lst entries needed for GRUB, but the Ubuntu LiveUSB uses a fairly complicated syslinux configuration. Besides, I would like to keep as much of the current LiveCD/LiveUSB look-n-feel without porting the syslinux config over to GRUB.
At the suggestion of ~quack I tried a menu.lst entry of:
title Ubuntu 9.10 LiveCD
root=(hd0,0)
kernel /ubuntu-9.10/syslinux/isolinux.bin
but GRUB responded with an Error 13: Invalid or unsupported executable format. At the GRUB commandline I then tried:
grub> root=(hd0,0)
grub> kernel /syslinux/isolinux.bin
because I have a second isolinux.bin file in that location, but GRUB responded with the same error. I also tried:
grub> chainloader /syslinux/isolinux.bin
and once again received the Error 13. Finally, I tried at the GRUB command line:
grub> root=(hd0,0)
grub> kernel /ubuntu-9.10/install/mt86plus
grub> boot
and that worked
What I would really like is a way to have GRUB call syslinux/isolinux bootloader. Then syslinux could load its own menu and whatnot.
Anyone know how to do this?
I have been managing Debian, and now Ubuntu, desktop systems for a small shop for several years now. I am very comfortable with apt for package management and distribution upgrades. The Ubuntu installer has worked for every system I have needed to add. I have not touched Red Hat for many years and have never really managed any RHEL systems.
I have an opportunity to take over a RHEL and CentOS shop. I am looking for a list of issues / management concerns specific to rolling out RHEL and CentOS as desktop environments for multiple users who have a mix of Dell desktop and laptop systems.
What issues should I watch for when rolling out CentOS as a desktop environment?