Letters to the Editor
Hi! I would like to thank you for doing so interesting a journal. It's my second subscription to LJ, and it won't be the last. I found the XForms review and tutorial so interesting that I decided to test it and will, perhaps, even use it at work. I enjoy reading tutorials and explanations about the Linux kernel (thanks a lot to Michael K. Johnson and all the staff of Linux Journal).
You try to spread the Linux enthusiasm everywhere. It's a success. Thank you.
Juergen Schmidt, an attentive reader, reported a few errors in the third Kernel Korner article about device drivers, co-authored by Georg van Zezchwitz and myself. The errors are my fault, due to the limited time I had to revise the article.
The code printed within the article comes from a real driver, and it is known to run, but sometimes, I forgot to substitute the name of a symbol while copying from the real driver to the article's text.
So, Skel_Board (the structure) should read as Skel_Hw; hwp (the pointer) is equivalent to board (replace either one with the other); in skel_select, file (the struct file pointer) should read filp.
I'm sorry for these inconsistencies, and I hope they didn't cause headaches to the readers.
—Alessandro Rubini email@example.com
I have a few corrections to my article Building a Linux Firewall in LJ #24, April 1996, page 49.
1) Figure 3 is a duplicate of Figure 2. This is my fault. I submitted it this way. Obviously, cut-and-paste from one xterm to another can either be your friend or your enemy. I must have copied from the wrong window. The correct contents for the figure are shown here:
# ipfw -n list b Type Proto From To Ports deny udp anywhere 192.168.1.1/32 any -> any deny udp anywhere 220.127.116.11/32 any -> any accept udp anywhere 18.104.22.168/32 domain -> any accept udp 22.214.171.124/24 126.96.36.199/32 any -> snmp deny tcp anywhere 188.8.131.52/32 any -> any deny tcp anywhere 192.168.1.1/32 any -> any
Figure 3. New blocking rule for SNMP to only accept from 184.108.40.206.
I've squeezed that down. Please use a condensed courier font to make it fit, or somehow make it a wide inline figure.
2) Several of the ipfwadm commands on page 58 have an additional character within the command line. The character is a right angle bracket, and this could cause some undesirable side effects if typed in that way.
3) The sentence on page 53 “ipfw only supports the deny and accept policies, not reject.” should be corrected to, “ipfw only supports the deny and accept policies for its output. A rule set to reject will still show up as deny.”
—Chris Kostick firstname.lastname@example.org
During the Space Shuttle mission STS-75, an astronaut was heard talking about the fact that Linux was installed on a computer on board the spacecraft. A few weeks later, the computer's function was disclosed. The software in use was X-based software developed under Digital Unix and ported to Linux so that it could be used on board the shuttle. Astronaut Ron Parise said in an e-mail message to fellow amateur radio operators:
Pat, et al.:
Linux was installed on one of the IBM Thinkpads that are usually flown on the shuttle. This was in support of the tether experiments. Since the ground-based applications to control those experiments ran on a DEC Alpha it was easy to just port them to a Linux system for on-board use.
73's, Ron WA4SIR
|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!
- Designing with Linux
- Wondershaper—QOS in a Pinch
- January 2015 Issue of Linux Journal: Security
- Internet of Things Blows Away CES, and it May Be Hunting for YOU Next
- Ideal Backups with zbackup
- Red Hat Enterprise Linux 7.1 beta available on IBM Power Platform
- Slow System? iotop Is Your Friend
Editorial Advisory Panel
Thank you to our 2014 Editorial Advisors!
- Jeff Parent
- Brad Baillio
- Nick Baronian
- Steve Case
- Chadalavada Kalyana
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- Philip Jacob
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- Steve Marquez
- Dave McAllister
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- Mike Roberts
- Chris Stark
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- David Lynch
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- Charnell Luchich
- James Walker
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- David Lane