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Jan
9
comment How do you use hardware load balancers with IP ACLs?
This is sometimes referred to as the load balancer being "transparent", that is, not changing the source IP address seen by the machines behind it.
Jan
9
comment 255.255.255.255 broadcast address meaning
1.2.0.0/0 cannot be a network address because a network address has all the host bits set to zero. Since /0 means all the bits are host bits, the only valid /0 network address is 0.0.0.0/0.
Jan
7
revised Ethernet frames: what are the source and destination MAC addresses?
The question asks about the frames' MAC addresses, not IP addresses.
Jan
4
comment Allow external domains to use my nameserver without using BIND
Alternatively, you could run a nameserver that had been modified to return whatever information you want. If you know what you're doing, you can modify bind to return a specific set of A records for any domains that weren't specifically configured but had your server listed as a nameserver.
Jan
4
answered df showing wrong size on opensuse in brand new disk
Jan
4
comment How to increase video memory in libvirt/KVM gui?
What's your outer problem? Why do you want to increase the video memory?
Jan
4
awarded  Enlightened
Jan
4
awarded  Nice Answer
Jan
4
comment What is causing all these DNS queries?
Our medium-traffic domains average 30 queries per minute (total on all authoritative name servers). You're seeing more than 50 times that.
Jan
4
comment What is causing all these DNS queries?
Clearly either Amazon's billing is in error or someone is specifically trying to run up Amazon Route 53 bills.
Jan
3
comment DNS and DHCP addresses aren't matching up
Do you see entries that are more than 2 days out of date?
Jan
3
comment Do I need to trim my SSD? How?
(The above assumes you never TRIM.)
Jan
3
comment Cascading gigabit switch (10/100/1000) with fast ethernet switch (10/100)
Are they all managed switch? All unmananged? Some of each? (And slow to access the server? Each other? The Internet?)
Jan
3
answered What is using all my RAM? Understanding the output of top
Jan
3
comment Do I need to trim my SSD? How?
@alfish SSDs slow down as soon as the total amount of data that has ever been written to the SSD during its life equals the total amount of data the SSD can hold at once. At that point, most writes will be to pages that have to be erased before they can be written to.
Jan
1
answered How to fix RVM exhausting Virtual Memory on VPS?
Jan
1
comment Network configuration: is it possible?
You can do it in a single broadcast domain. By "private", he means unroutable, RFC1918 IP addresses, not that it needs to be firewalled. NAT on a stick works fine if you just want to make things work.
Jan
1
comment Assigning Processes to CPU Cores
A lot of additional information would help. Are you serving static pages? Dynamic pages? What does the network traffic level look like? How is apache tuned currently?
Jan
1
revised How does network sniffing software work over a switch?
added 85 characters in body
Jan
1
answered How does network sniffing software work over a switch?