3,961 reputation
917
bio website
location London, United Kingdom
age 43
visits member for 5 years, 4 months
seen Oct 16 at 19:48
Quite boring, really. Have faffed about with computers since the mid-80s, have worked as a network engineer, unix sysadmin and (occasionally) developer.

Jul
8
answered DHCP/Network problems
Jul
1
answered Monitoring incoming email server
Jun
30
comment What is the fastest network technology these days to couple servers
A hub is by definition not limiting collission domains (they're effectively repeaters, only with more than two ports). A switch should significantly limit your collision domain sizes (although there are cases where packets will be broadcast out). It becomes even better if you use full-duplex links all throughout.
Jun
29
comment Business Internet Outage/Disaster Recovery
If you're lucky, they'll have "independednt routing to site" as an option and at that point, anything that takes out one T1 should, hopefully, leave the other one OK.
Jun
29
comment Most popular misconceptions about networking
Most manufacturers that run multible fabrication lines are probably using a PRNG of some sort to assign the lower 24 bits of the MAC (so as to not need to keep uniqueness between multiple production lines), so for those, you can estimate 50% chance of a collission of you have 2^12 (so 4096) network cards within the same broadcast domain.
Jun
23
answered Are there any well known anti-patterns in the field of system administration?
Jun
22
answered The IT Manager is Leaving - What do I lockdown?
Jun
22
comment UPS and power strip interactions?
The "fire hazard" is that the wiring inside the power strip is only rated for a given wattage and plugging more power-strips into it makes it MUCH easier to exceed the wattage and cause overheating inside the unit, with a possible fire as a result.
Jun
21
answered Most popular misconceptions about networking
Jun
18
answered Basic firewall, switch, & router device?
Jun
17
answered Windows / Cisco MAC problem
Jun
17
answered When is the right time to add a separate database server, add more web servers?
Jun
15
comment Cisco ASA5510 Bandwidth Shaping/Limiting
Off-hand, I don't know how much license it gives the ASA to burst. The goal of a shaper (as opposed to a policer) is to roughly enforce a speed limit, by delaying packets as necessary, in a relatively graceful manner. Very helpful when you have UDP streams you need to cater for. Policing is more useful with TCP streams or when you want instant feedback on UDP streams. If I remember correctly, you should be able to tune to what extent a shaper can borrow unused bandwidth from the past and over-supscribe future bandwidth usage (but on average it won't do more than you've specified as target).
Jun
12
answered DVMRP vs PIM-DM multicast protocols
Jun
12
comment Batch processing on Linux
I haven't tried it with lpd, but I have tried it with lpsched (the old SysV scheduler). There it's simple, as the "printer backends" are all shell scripts (by default). At a very, very previous job, we had a Rayshade "print queue" that rendered jobs and dumped the resulting images in user home directories.
Jun
11
comment Cisco ASA5510 Bandwidth Shaping/Limiting
The (simple, but not entirely correct) difference between shaping and policing is that shaping delays packets, policing drops them. If you have WFQ enabled (look for "fair-queue" or "no fair-queue" in the interface config), it should preferentially drop packets from more active streams. Unfortunately, there isn't a good way of doing "per-stream" limiting without quite deep packet instpection and state-keeping.
Jun
8
answered Password expiration policies
Jun
8
answered Cisco ASA5510 Bandwidth Shaping/Limiting
Jun
8
answered How to debug slow network pings
Jun
8
answered Favorite Unix command line aliases?