Linux allows you to view and change the ephemeral port range by simply using the file /proc/sys/net/ipv4/ip_local_port_range. For example, this shows the default configuration on a kernel 2.2 system:
$ cat /proc/sys/net/ipv4/ip_local_port_range
1024 4999
To change this to the preferred range, you could do (as superuser):
# echo "49152 65535" > /proc/sys/net/ipv4/ip_local_port_range
Layer 4 switching: The magic combination - NetworkWorld.com
Multilayer Switch - Wikipedia.org
A Layer 7 Switch performs wire-speed processing of packet header content, not only at Layer 2 or Layer 3, but also at the transport layer (Layer 4) up through the application layer (OSI’s Layer 7). Layer 7 switch integrates routing and switching by forwarding traffic at layer 2 speed using layer 7 information. For example, an XML switch can analyze the XML tags at the application level and make forwarding decisions. -- javvin.com
Parted Magic is a Linux LiveCD/USB/PXE with its elemental purpose being to partition hard drives.
Optimized at approximately 45MB, the Parted Magic OS employs core programs of GParted and Parted to handle partitioning tasks with ease, while featuring other useful programs (e.g. Partition Image, TestDisk, fdisk, sfdisk, dd, ddrescue, etc.) and an excellent set of documentation to benefit the user. An extensive collection of fileystem tools are also included, as Parted Magic supports the following: ext2, ext3, ext4, fat16, fat32, hfs, hfs+, jfs, linux-swap, ntfs, reiserfs, reiser4, and xfs.
The latest version is updated with: Linux 2.6.24.3, Parted 1.8.8, ntfsprogs-2.0.0, ntfs-3g-1.2506, and GParted-0.3.7.
Parted Magic uses Busybox for basic Unix commands and networking, the Dropbear SSH server and client, and Firefox to surf the web.
The current Xserver is xorg-server-1.4.0.90 with the following drivers: apm, ark, ati, chips, cirrus, cyrix, glint, i128, i740, i810, mga, neomagic, nv, r128, riva128, radeon, rendition, s3, s3virge, savage, siliconmotion, sis, tdfx, tga, trident, tseng, vesa, vmware, and voodoo.
The mini Xserver, Xvesa, is also available.
Parted Magic falls under the terms of the GPL.
If you, like me, make frequent changes to your host file, for instance because your staging and production environment both listen to the same vhost. You will have probably noticed that it takes Firefox a while to pick up on the alterations you made. This is because in order to improve performance by default Firefox caches DNS lookups for up to 60 seconds. If you do not feel like waiting, restarting the browser is your only option. Fortunately you can disable DNS caching. This is what you do :
Enter about:config in the adress bar.
Right click on the list of properties, select new > integer in the context menu
enter network.dnsCacheExpiration as the preference name and 0 as the integer value
Add another integer preference, this time use network.dnsCacheEntries as the preference name and again 0 as the value
使用 proxy 访问 blogspot 很久了, 昨晚在家突然访问不了我的 blog 了, 以为是临时网络故障所致, 没有在意. 今早来公司再次访问俺的 blog, 仍然失败, 怪. 难道 ...? 修改 firefox 的 settings, 去掉 proxy 设置, 竟然能直接访问 blogspot 了, 喜. google 一下 ‘blogspot 解禁’, 果然是解禁了, 但愿不是临时的.
