IP Bandwidth Management
In our setup, we have two virtual web servers on a single Linux machine. The setup script (Listing 1) includes some commented sample IP-aliasing examples using the supplied ip utility. The ip utility is feature-loaded and not in the scope of this article. IP addresses 10.0.0.10 and 10.0.0.11 are attached (aliased on) to device eth0 in the example.
To test, use ftp to get to another machine on the network. First, use ftp to get to IP address 10.0.0.10, where you should observe a rate of approximately 1Mbps. Quit that ftp session and start another one to 10.0.0.11, where you should observe a throughput of approximately 3Mbps.
These are very exciting times for Linux. As far as I know, Linux is the most sophisticated QoS-enabled OS available today. The closest second is probably BSD's ALTQ, which lags quite a bit behind the sophistication, flexibility and extensibility found in Linux TC. I am not aware of any such functionality in Microsoft products (perhaps someone could provide pointers if they exist). Sun Solaris does have a CBQ and RSVP combo they sell as a separate product. I predict a huge increase in the use of Linux servers as a result of the many features available with TC. Alexey has taken Linux to a new level.
Support for the IETF diffserv features is also in Linux. The work extends the TC to add the most flexible diffserv support known today. Diffserv support was made possible through efforts by Werner Almesberger (who also wrote LILO, Linux-ATM and more) and myself. For more details, see http://lrcwww.epfl.ch/linux-diffserv/.
All listings referred to in this article are available by anonymous download in the file ftp.linuxjournal.com/pub/lj/listings/issue62/3369.tgz.
Jamal Hadi Salim (firstname.lastname@example.org) is a hacker wannabe. He spends a fair amount of his spare time staring at Linux networking code. Jamal was the original author of the Sendmail-UUCP HOWTO and is the CASIO digital diary serial driver/application author, which he still maintains. He also has sent the occasional patches to many things, including the kernel, biased towards networking issues. Currently, his efforts are focused mainly in the network scheduling code where he co-authored the Linux diffserv code with Werner Almesberger.
|PostgreSQL, the NoSQL Database||Jan 29, 2015|
|HPC Cluster Grant Accepting Applications!||Jan 28, 2015|
|Sharing Admin Privileges for Many Hosts Securely||Jan 28, 2015|
|Red Hat Enterprise Linux 7.1 beta available on IBM Power Platform||Jan 23, 2015|
|Designing with Linux||Jan 22, 2015|
|Wondershaper—QOS in a Pinch||Jan 21, 2015|
- PostgreSQL, the NoSQL Database
- Sharing Admin Privileges for Many Hosts Securely
- HPC Cluster Grant Accepting Applications!
- Internet of Things Blows Away CES, and it May Be Hunting for YOU Next
- Wondershaper—QOS in a Pinch
- Designing with Linux
- Ideal Backups with zbackup
- January 2015 Issue of Linux Journal: Security
- Slow System? iotop Is Your Friend
- Non-Linux FOSS: Animation Made Easy
Editorial Advisory Panel
Thank you to our 2014 Editorial Advisors!
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- David Lynch
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