The web is flooded with examples of how to use the popular MRTG software for plotting more exotic SNMP OIDs than just network traffic.
One of the more popular variables to graph seems to be the load average of a given system, but all of the examples I have stumpled upon online compromise when it comes to plotting the load average as a floating point value.
It is, however, possible to post-process the gathered statistics before plotting the graph and the legend using the
Factor keywords as shown in the example below:
Options[load]: gauge, nopercent, noo
Title[load]: 5 Minute Load Average
PageTop[load]: <h1>5 Minute Load Average</h1>
YLegend[load]: Load Average
Legend1[load]: 5 Minute Load Average
Legend3[load]: Maximum Observed Load Average
LegendI[load]: Load Average:
The above example will gather the 5 minute load average as an integer value (average load x 100) of localhost and use a scaling factor of 0.01 before actually plotting the graph.
Judging from the examples I have found online, the
noo option and the
PseudoZero pseudo OID used in the example are other, often overlooked features of MRTG. The
noo option specifies that no “Output” graph shall be plotted while the
PseudoZero pseudo OID always returns 0 (whereas
noi disables the “Input” graph and
PseudoOne always returns 1).
Having had my iPhone 3G for a month now, I think it’s time for a quick status report slash review slash list of annoyances – in no particular order:
Missing Status Bar Icon for Ringer/Silent Switch
A minor thing, sure, but I can not count how many times I have missed an SMS notification or an incoming call simply because I’ve forgotten to turn the ringer back on upon leaving a meeting. Of course, the switch on the side indicates the current ringer mode, but a visual indication in the top status bar on the display would be nice.
More than a few times when the iPod application was playing music and Safari was busy downloading or scrolling a heavy weight web page, my iPhone crashed or locked up hard – requiring a manual restart (holding down Home and Sleep/Wake button for a few seconds) in order to get back to working condition. Rather annoying. [Update: This seems to have been fixed by update to iPhone OS 2.0.2]
Inconsistent Screen Locking
Locking the screen while the iPod is playing does not lock the volume keys on the side – often resulting in the volume keys being activated by accident while the iPhone is tucked away in my pocket, which is quite annoying. It would be nice to be able to configure this behaviour. Also, double-clicking the Home button while the screen is locked still brings up the iPod controls (if this feature is enabled in Settings) – again, it would be nice if it was configurable if the screen lock should disable double-clicking as well.
Lack of Calendar Synchronization
For some reason, Apple does not (yet?) allow third party applications to access the calendar on the iPhone, and since the built-in calendar can only synchronize with MobileMe and Exchange over the air, this leaves the calendar application pretty much useless if you do not use either of those for your calendar. I’d love to see the calendar opened either opened up for third party applications or at least a way to synchronize the calendar using less … ahem … expensive solutions (e.g. the calendar on my iPod Nano can read a standard *.ics file – the iPhone e-mail client can read a *.vcf file and import its contents into the Contacts application, but it can not open an *.ics file).
Despite the above annoyances I am still quite pleased with my iPhone 3G. It is by far the most advanced mobile device I have ever had, and it beats the features of my previous mobile phones with several lengths. I hope – perhaps I’m just being naive – that the rumoured 2.1 firmware will address some of the above mentioned issues.
While debugging connectivity issues on my recently installed CyberCity ADSL line, I came to suspect the ZyXEL router supplied to me by the ISP.
Erwin kindly offered to lend me a good old Cisco SOHO 77 ADSL router to test with, which meant I had to find out how to actually configure this device for use with CyberCity.
It didn’t take long, though – below my configuration for reference:
- dsl654321 is my CyberCity user name
- 188.8.131.52 is my public IP address
- The example configuration contains a static PAT for all ports to 192.168.0.2
Current configuration : 2137 bytes
no service pad
service timestamps debug datetime localtime show-timezone
service timestamps log datetime localtime show-timezone
logging buffered 8192 debugging
enable secret 5 **removed**
clock timezone CET 1
clock summer-time CEST recurring last Sun Mar 2:00 last Sun Oct 3:00
ip domain lookup source-interface Loopback0
ip name-server 184.108.40.206
ip name-server 220.127.116.11
ip dhcp pool soho77
network 192.168.0.0 255.255.255.0
dns-server 18.104.22.168 22.214.171.124
lease 0 1
ip address 192.168.255.1 255.255.255.0
no ip address
ip address 192.168.0.1 255.255.255.0
ip nat inside
no cdp enable
hold-queue 100 out
no ip address
no atm ilmi-keepalive
dsl operating-mode ansi-dmt
encapsulation aal5mux ppp dialer
dialer pool-member 1
ip address negotiated
ip nat outside
dialer pool 1
ppp authentication pap callin
ppp chap hostname dsl654321
ppp chap password 7 **removed CyberCity Password**
ip nat inside source list 1 interface Dialer0 overload
ip nat inside source static 192.168.0.2 126.96.36.199 extendable
ip route 0.0.0.0 0.0.0.0 Dialer0
no ip http server
access-list 1 permit 192.168.0.0 0.0.255.255
dialer-list 1 protocol ip permit
no cdp run
snmp-server engineID local 000000090200000427FD16B9
snmp-server community **removed** RO
snmp-server enable traps tty
banner motd ^C
* UNAUTHORISED ACCESS PROHIBITED *
line con 0
exec-timeout 60 0
password 7 **removed**
transport output all
line vty 0 4
exec-timeout 60 0
password 7 **removed**
transport input all
transport output all
scheduler max-task-time 5000
sntp server 188.8.131.52
After having heard so much about LinkedIn from friends, family and former colleagues I finally decided to get my own profile there – and wow, what a system. A truly great way to visualize your social and professional networks!
My public profile can be found here.
While searching for a replacement for my Atheros AR5212 based miniPCI card and at the same time searching for some pigtails for use with a DIY directional antenna I found myself in the usual mess of matching IEEE 802.11 cards and antennas with connectors and vice versa.
I stumbled across a German site which not only carries a lot of wifi related datasheets and tips also has an – incomplete, of course – list of cards and their connector types. It’s not much, but it might be enough to get you on the right track when ordering your next pigtail or antenna.
Ever had a task for which sed(1) seemed like the obvious tool but couldn’t figure out the correct syntax to use and instead ended up firing up a Perl interpreter? Do not dispair, help is near! Eric Pement compiled a nice set of hints on using sed(1) in his sed1line.txt tutorial.
I discovered this tutorial long time ago, but seeing how often I find myself browsing it to find the optimal syntax, I thought I’d share it with you :)
I stumbled across this cool site a few days back while surfing the web. It allows you to examine the statistics for a given PGP key and it even lets you examine the trust path(s) between a given pair of PGP keys.
Play with it a bit and see for yourself – you’ll find that it is a small World after all.
Ahh, ThinkGeek, the magic wonderland of geeky gizmos you simply can not live without. Here’s my present top 5 shopping list for ThinkGeek. Order? No, no particular order.
Good thing Christmas will be here soon (cough).
Wow, it seems pippin finally got the Genetically Engineered Goat, Large (sometimes mistakenly referred to as the Generic Graphical Library) up and running – perhaps there is hope yet to see a new and shiny core in a not too distant “next week” edition of the GIMP?
After months in cryogenic sleep I now have a new home for my weblog: http://blog.brixandersen.dk/
Please update your bookmarks and RSS feeds, as I wont be making any more posts to my old blog at http://planet.gentoo.org/developers/brix/ . A big thank you to the Planet Gentoo admins for having me, and for putting the deletion of my blog there on hold so far.
Stay tuned for new and exciting entries, primarily about FreeBSD and other OSS related stuff. The comments feature will be enabled shortly.
[edit on 2006-10-19: comments are up and running too, now].