COGNITIVE RADIO Physical Layer

Hi
How to install cognitive radio patch and its attacking and detecting patches with related to NS-2.35

I've long wanted to delve into these methods of HD manipulation but here's the thing: I only have 1 hard drive -- a 1TB, and the more I read the more it seems the main point of using these techniques is to utilize that extra layer of abstraction to bridge HDD's in some version of a RAID setup.

Of course I've also read the performance is better, along with snapshot capability, on-the-fly partition resizing, striping, etc. These prospects excite me. So finally, two questions:

1) With just one physical drive, is it worth creating a new partition table to include these technologies?
2) With all of the above methods, there is no way I can keep the data on any part of this PV if I want to venture into LVM, ZFS or Btrfs, correct?

p.s. I've got 12 partitions (one swap, one extended, one very large one logical partition that serves the 9 linux distros which fill the remaining partitions as a hold of media, documents, music, etc.

I have a typical requirement, I want to have a converter module, that can convert UDP packet to TCP packet. And I need to do it before the packet can be processed in IP layer.

I will explain this complete scenario using an example

Lets say we have 3 machines A, B and C.

A sent an UDP packet
B received UDP packet
At B, when packet is being given to IP layer (from Link / MAC / Ethernet layer) , I want to get hold of packet. I want to delete the UDP and IP header in packet. I want to add TCP and IP header (assuming C is the destination host).
Now from B machine, packet is sent to C machine

Can somebody help me how this can be done. I am using linux machines.

Though libpcap can be one of the option (from wireshark), but it is not suitable for me because of performance reasons. I want a very light weight solution for this problem.

Everything is working great on this server, however I am seeing Disk doesn't contain a valid partition table. I have no issue reading and writing, this something that can be ignored?


Disk /dev/xvda: 32.2 GB, 32212254720 bytes
255 heads, 63 sectors/track, 3916 cylinders, total 62914560 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Device Boot Start End Blocks Id System
/dev/xvda1 * 16065 62910539 31447237+ 83 Linux

Disk /dev/xvdf: 1099.5 GB, 1099511627776 bytes
255 heads, 63 sectors/track, 133674 cylinders, total 2147483648 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Disk /dev/xvdf doesn't contain a valid partition table

Disk /dev/xvdh: 1099.5 GB, 1099511627776 bytes
255 heads, 63 sectors/track, 133674 cylinders, total 2147483648 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Disk /dev/xvdh doesn't contain a valid partition table

Disk /dev/xvdg: 1099.5 GB, 1099511627776 bytes
255 heads, 63 sectors/track, 133674 cylinders, total 2147483648 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Disk /dev/xvdg doesn't contain a valid partition table

Disk /dev/xvdi: 1099.5 GB, 1099511627776 bytes
255 heads, 63 sectors/track, 133674 cylinders, total 2147483648 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Disk /dev/xvdi doesn't contain a valid partition table

Disk /dev/mapper/vgebs-lvebs: 4398.0 GB, 4398029733888 bytes
255 heads, 63 sectors/track, 534696 cylinders, total 8589901824 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 2097152 bytes / 4194304 bytes
Disk identifier: 0x00000000

Disk /dev/mapper/vgebs-lvebs doesn't contain a valid partition table

Disk /dev/xvdj: 32.2 GB, 32212254720 bytes
255 heads, 63 sectors/track, 3916 cylinders, total 62914560 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Disk /dev/xvdj doesn't contain a valid partition table

Hello everyone,
i would like to encrypt & decrypt data at the application level.
This data needs to be send to another device via wireless.I found one such cipher named ceaser cipher in the internet.But it looks weak and easy to be broken. Can someone suggest me robust cipher's concepts which can be done at application layer?

Hi All;
Can someone give me some guidance on partitioning a 4TB drive into one partition ?

My goal is to align the partition for best performance. I searched the net for advice and I've found a lot of information on it but am still confused.

After setting the label to gpt,

I tried mkpart primary 0% 100%
and I get the warning that the partition isn't aligned

then I tried mkpart primary 1 -1 (which I really hoped would get me completed)

and when I do an align-check on partition 1, it reports 1 aligned

but then when I do an fdisk -l,
I get the warning that partition 1 does not start on a physical sector boundary

I read that sector size is usually 512 bytes but on some (or perhaps all) larger disks, the sector size is 4096.

I am really not knowledgable in this area and not sure if the above message about partition 1 not starting on a physical sector boundary is important or what impact this will have to my performance. Since these 4tb drives are being used in a media server, I'd like them to be as fast and efficient as possible.

Can you offer some guidance or perhaps some commands on how to partition my (full) 4tb drive into one partition so it is aligned and also so the partition table starts on a physical sector boundary ?

Also, is there a Ubuntu utility to display the sector size of a disk?

I have been researching this issue off and on for a few weeks and would like to finally get this partitioning completed this weekend so I can get on with setting up my system.

Thanks.

Tim

I just cloned a Centos7 "everything install" VM to a physical disk using VMWare Workstation and Clonezilla using the instructions he https://www.howtoforge.com/convertin...cal-machine-p2

Now, when the clone (physical disk) boots up, it drops into the command line with this:

Quote:
dracut-initqueue[417]: Warning: Could not boot.
dracut-initqueue[417]: Warning: /dev/disk/by-uuid/4b8b5627-9027-46f7-b722-61d3ddd28e74 does not exist Starting dracut emergency shell...
What I've tried:
1. I checked /etc/fstab and the proper UUIDs are there, including the one above.
2. Tried booting via USB stick installer into rescue mode, chroot /mnt/sysimage , and:

Quote:
mv /boot/initramfs-$(uname -r).img /boot/initramfs-$(uname -r)-oh_crud.img
and then
Quote:
dracut /boot/initramfs-$(uname -r).img $(uname -r)
...but I get this:

Quote:
cat: write error: Broken pipe
When I enter "blkid", I see the HD in question showing up as both /dev/block... and /dev/sdb... I tried "lshw -class disk" but it says "command not found". Finally, the rescue shell says it is mounting my disk in /mnt/sysimage and all my files are where they should be, so it appears it is seeing and mounting the HD.

Any suggestions? I am a n00b, so going off a lot of google and not a lot of understanding here.

I have windows 7 and the factory recover on 2 of the partitions That I wish to keep

I am using phpVirtualBox, and everything is working perfectly. Then something changes, and I get the following error:
Code:

Could not connect to host (http://127.0.0.1:18083/)

I reboot the physical machine, or execute /etc/init.d/vboxweb-service restart, and then everything works for a while.

According to http://sourceforge.net/p/phpvirtualb...onnect-to-host, there are three reasons why this will happen.
Quote:
This indicates that phpVirtualBox could not connect to the vboxwebsrv server. Either the location setting in config.php is wrong, vboxwebsrv is not running on the VirtualBox host, or SELinux is blocking access to vboxwebsrv. If you have SELinux enabled
As shown below, it is not reason 2 or 3.

Code:

[root@devserver ~]# service vboxweb-service status
Checking for VBox Web Service ...running
[root@devserver ~]# service vboxdrv status
VirtualBox kernel modules (vboxdrv, vboxnetflt, vboxnetadp, vboxpci) are loaded.
[root@devserver ~]# service vboxautostart-service status
Usage: /etc/init.d/vboxautostart-service {start|stop}
[root@devserver ~]# service  vboxballoonctrl-service status
Checking for VBox watchdog service ...not running
[root@devserver ~]# sestatus
SELinux status:                 enabled
SELinuxfs mount:                /selinux
Current mode:                   permissive
Mode from config file:          permissive
Policy version:                 24
Policy from config file:        targeted
[root@devserver ~]#

Thus it must be that the location setting in config.php is wrong. config.php has the following default settings, and I left them as is.

Code:

/* SOAP URL of vboxwebsrv (not phpVirtualBox's URL) */
var $location = 'http://127.0.0.1:18083/';
...
// Host / ip to use for console connections
#var $consoleHost = '192.168.1.40';

According to http://sourceforge.net/p/phpvirtualb...-configuration, "If VirtualBox and phpVirtualBox are on the same physical host, you may leave the $location setting alone". VirtualBox and phpVirtualBox are definitely on the same physical machine.

Please provide recommendations.

I got this configuration.

fdisk -l

Disk /dev/sda: 493.9 GB, 493921239040 bytes
255 heads, 63 sectors/track, 60049 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0002ac38

Device Boot Start End Blocks Id System
/dev/sda1 * 1 64 512000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 64 32636 261630976 8e Linux LVM

Disk /dev/mapper/vg_gazduire-lv_root: 53.7 GB, 53687091200 bytes
255 heads, 63 sectors/track, 6527 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000


Disk /dev/mapper/vg_gazduire-lv_swap: 5100 MB, 5100273664 bytes
255 heads, 63 sectors/track, 620 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000


Disk /dev/mapper/vg_gazduire-lv_home: 209.1 GB, 209119608832 bytes
255 heads, 63 sectors/track, 25424 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000


df -h

Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_gazduire-lv_root
50G 21G 27G 44% /
tmpfs 2.4G 0 2.4G 0% /dev/shm
/dev/sda1 485M 161M 299M 35% /boot
/dev/mapper/vg_gazduire-lv_home
192G 17G 166G 9% /home
/usr/tmpDSK 2.0G 981M 955M 51% /tmp


I want to increase the /dev/sda1 with aproximativ 200 gb who remains ! My plans a i want to make /dev/sda3 and i want to put in
vg_gazduire!

VG Name vg_gazduire
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 4
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 3
Open LV 3
Max PV 0
Cur PV 1
Act PV 1
VG Size 249.51 GiB
PE Size 4.00 MiB
Total PE 63874
Alloc PE / Size 63874 / 249.51 GiB
Free PE / Size 0 / 0



When i type fdisk /dev/sda3 the system give me Unable to open /dev/sda3!

Could anyone tell me the solution?