22,188 reputation
12450
bio website ripplelabs.com
location Oakland, California
age 45
visits member for 3 years, 5 months
seen 14 hours ago

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


Apr
2
revised Is it possible to cross-connect two AUI ports without transceivers?
added 5 characters in body
Apr
2
answered Is it possible to cross-connect two AUI ports without transceivers?
Apr
1
comment High load on X3220 Quad Core Linux Apache server
If you only have a single server that runs both MySQL and the web servers, there's no reason the MySQL port needs to be accessible from the Internet.
Apr
1
comment DDoS false IP attack
Figure out what it is about the attack that's allow that traffic rate to cause high CPU usage and fix it.
Mar
31
comment How to fix customer display pole that displays garbage?
Are you sure the serial port is also set to 9600,O,8,1? Odd parity is unusual. Are you sure the pole is supposed to be set to 9600,O,8,1? Again, odd parity is very unusual and a parity mismatch could cause this kind of problem.
Mar
30
comment Can an internet connection be more robust when connecting through a VPN?
The classic example where it would help is if the stream source has two Internet connections, one of which is overloaded. If your path takes the bad connection, a VPN to an intermediary whose path from the stream source takes the good connection can make a big difference. Of course, in the more likely case that the problem is your link, and you only have one, it won't help.
Mar
30
revised SSL Certificate by GeoTrust not working
deleted 52 characters in body
Mar
30
comment Can an internet connection be more robust when connecting through a VPN?
A VPN to a network with a better connection to the streaming source network could help.
Mar
30
answered Can a switch consume bandwidth?
Mar
30
answered SSL Certificate by GeoTrust not working
Mar
29
comment LACP Total Speed
It depends on the exact LACP algorithm each end uses. Layer 3 devices typically use IP addresses in their hash rather than, or in addition to, MAC addreses. (For precisely this reason.) For example, Linux's LACP driver uses the last two octets of the source and destination IP addresses in addition to the MAC addresses.
Mar
28
comment Laptop being assigned IPv4 address out of router's DHCP range
The problem isn't the laptop, it's the rogue DHCP server.
Mar
28
comment More than half of the memory in use right after rebooting
What precisely happens when you attempt to allocate the memory?
Mar
28
comment More than half of the memory in use right after rebooting
RAM being in use is not a problem. If you don't want your RAM to be used, take it out of the machine. It's not like if you use only 8GB right now, you can use 24GB later. Any RAM not used now is forever wasted.
Mar
28
comment setsockopt EOPNOTSUPP (Operation not supported)
I think we're getting confused because we're doing this all through comments. Why don't you post a question about the issues you're having and include as much detail as possible about what changed, how you measured, and what you measured.
Mar
28
comment setsockopt EOPNOTSUPP (Operation not supported)
Err, 600 fiber miles further away or so. (Typically 400 actual miles or so, depending.) What's your ping time from where you measured that latency to the server itself or other servers/routers in the same data center? How does that compare to the previous location? (It's also possible your test involves more than one "back and forth" and so effectively multiplies the latency. For example, a typical TCP connection setup doubles the latency. If you have to tear it down, that adds another round trip, and so on.)
Mar
28
comment setsockopt EOPNOTSUPP (Operation not supported)
@brant: The higher CPU usage is basically meaningless since you're not under significant load -- you can't snooze efficiently. (And likely your older CPU had faster cores. What CPU was it?). The latency almost certainly is about network distance, not server performance. (20ms would just mean 10ms more each way -- a datacenter 150 fiber miles further away or so.)
Mar
28
comment setsockopt EOPNOTSUPP (Operation not supported)
Why would anyone try to solve this error? What purpose would QoS serve on a local connection?
Mar
28
comment map domain to subdomain
He will, however, also have to tell you that he's using that domain and you'll have to configure that in your server. Otherwise, when you get requests for host "markshop.com", you'll have no way to know you should serve the web pages for "markshop.shop.com".
Mar
28
comment setsockopt EOPNOTSUPP (Operation not supported)
This is normal behavior -- QoS isn't supported on local connections. (You say it's "over and over" but if you look, it's actually once per connection, the minimum needed to determine that QoS is not supported on that connection.) If there are any signals that point to a problem, you haven't told anyone what they are. We can't diagnose a problem if you don't even tell us a single symptom.