625 reputation
420
bio website gregmaclellan.com
location Canada
age 33
visits member for 5 years, 7 months
seen Dec 17 at 22:00

Professional software developer since 2000. Have worked on many open-source projects, and am currently employed as a senior web application developer.


Apr
7
accepted Windows 7 disk backup and clone for deployment to multiple systems
Apr
7
comment Are magnetic-tipped screwdrivers okay around servers?
Just decided to search as I just happened to see one of those "computer repair tool kits" specifically advertised as "demagnetized to prevent systems and magnetic media from damage". I took this as a downside, I hate using non-magnetic screwdrivers with computers. So many tiny screws and I'm sure shorting out the motherboard with a screw is a million times worse and more likely to cause damage than a magnet.
Mar
28
awarded  Popular Question
Mar
8
revised Windows 7 disk backup and clone for deployment to multiple systems
couple more links
Mar
8
asked Windows 7 disk backup and clone for deployment to multiple systems
Feb
10
awarded  Citizen Patrol
Oct
27
answered Switching local DNS servers disrupts printer
Oct
27
answered OpenVPN with two gateway and DNS server
Oct
27
comment Can I use IPv6 today?
Of course, depending on your target audience, having your site only on IPv6 could be an amazingly good way to keep out the riff-raff, so to speak.
Oct
13
revised Should I use an Asterisk GUI?
fix for grammar, formatting, and clarity.
Oct
11
accepted Recommendation on remote access setup for accessing customer systems
Oct
11
accepted Application for wall-mounted information display
Oct
6
asked Application for wall-mounted information display
Jul
13
accepted How do I forward all outbound mail sent from a given user in Exchange?
Jul
13
answered How do I forward all outbound mail sent from a given user in Exchange?
Jul
13
revised How do I forward all outbound mail sent from a given user in Exchange?
deleted 399 characters in body
Jun
29
awarded  Commentator
May
13
awarded  Yearling
May
10
comment What tangible security are gained by blocking all but a few outgoing ports in a firewall
For 1, if you are trying to prevent bittorrent (or other protocol) use, realize that people can still proxy/VPN to another machine and bypass your restrictions. Eg, in a school, adding firewall/hostname restrictions is a great way to teach kids about how to use proxy and VPN servers (which can be run on port 80, thereby not getting filtered by your simple firewall). SMTP is an exception, since malware can't proxy/VPN (it would defeat the purpose of sending spam from millions of random IPs), and 25/tcp is absolutely required for delivering messages to any mail hosts on the internet.
May
10
comment What tangible security are gained by blocking all but a few outgoing ports in a firewall
It will prevent naive malware - if they're using port 80 or 443, chances are those aren't blocked so it will still operate. Blocking port 25 to all but your own SMTP server is a very good idea though, since port 25 is actually the only port that can be used to deliver mail directly (without relaying) and thus will make spam trojans ineffective.