21,461 reputation
12449
bio website ripple.com
location Oakland, CA
age 44
visits member for 3 years, 2 months
seen 3 hours ago

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


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.
Mar
28
comment Private IP getting routed over Internet
@WernerCD: Actually, routes that don't exist on your network typically should go to your ISP. If you want to stop specific routes, you need to configure the firewall specifically. Blocking outbound traffic to private IPs is a common firewall configuration -- one that yours, apparently, doesn't have.
Mar
27
comment Private IP getting routed over Internet
Likely, to avoid accidentally sending such traffic to any of their Internet peers, Comcast injects a route that steers the traffic to a particular place. Routing is much more efficient than filtering. It's Comcast's network, they are free to use private IPs however they like. You sent the traffic to them.
Mar
27
answered setsockopt EOPNOTSUPP (Operation not supported)
Mar
27
comment Private IP getting routed over Internet
There is really no such thing as "an Internet server". There are just your servers and Comcast's servers. Your router forwarded the traffic to Comcast. If that's not what you wanted, change the configuration. Comcast is free to do whatever they want with the traffic.
Mar
27
comment Why is the port listed only in the specific format of netstat?
That's what netstat does. By default, it tries to show human-readable ports (unless you specify -n). When it succeeds, the port number does not appear in the output.
Mar
26
answered Requesting better explanation for expires headers
Mar
26
comment What is the correct response for a DNS server when a domain does not exist?
The .mil nameservers are strange and don't seem to like returning authoritative NXDOMAIN responses. If you try a nonsense .com address (or a nonsense TLD like foo.z9pp), you should get something other than a timeout.
Mar
25
comment Dropping Cached Memory on FreeBSD
It's not like if you use half as much memory today you can use twice as much tomorrow. Any memory you didn't use is opportunity forever wasted. Plus, it's wasted effort to make the memory free only for the system to have to expend effort to make it used again. Simply keeping it used (switching directly from one use to another) is much more efficient.