22,188 reputation
12450
bio website ripplelabs.com
location Oakland, California
age 45
visits member for 3 years, 5 months
seen 9 hours ago

I am Chief Cryptographer at Ripple Labs and one of the architects of the Ripple payment system.


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Do you see entries that are more than 2 days out of date?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?
Dec
31
answered some startup-scripts are ignored (on debian 6.0)
Dec
31
answered UBUNTU 10.04 64 vlan not passing traffic for 32 sec
Dec
31
comment UBUNTU 10.04 64 vlan not passing traffic for 32 sec
What kind of switch do you have and what is the exact command you used to setup portfast? This is almost definitely the time it takes spanning tree to converge.
Dec
31
comment Why add an IPv6 address as /64?
IPv6 addressing is based around the fundamental assumption that address space is not scarce. So even if you aren't going to have a real network and will only use one IP address, you are still supposed to assign a /64. Even if it's strictly a host address, you still assign a /64. (The only reason we don't do that with IPv6 is because address space is scarce. Otherwise, it'd be convenient if the subnet mask was always the same length -- one less thing to get wrong, plus plenty of spare addresses in case we discover we need another.)