21,591 reputation
12449
bio website ripple.com
location Oakland, CA
age 45
visits member for 3 years, 3 months
seen 5 hours ago

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


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.
Mar
24
comment Security when SSH private keys are lost
@SvenW: After regenerating the public key, you can just run a script to search all machines lists of authorized keys for that public key. (Essentially a grep on the various ssh directories for a sequence of, say, 12 characters taken from it.) The question asks, "In other words, How do I recall, the public key associated with this Private key." and the first step in doing that is to figure out what that public key is so you can search for it.
Mar
23
comment Git fails to push with error 'out of memory'
Is this a 32-bit or 64-bit build of git? This is usually caused by some very restrictive limit on virtual memory imposed by a bone-headed administrator who doesn't realize that virtual memory is not a scarce resource and should not be aggressively limited. Can you paste your ulimit -a output?
Mar
23
revised Traffic shaping with tc doesn't work for high delay and bandwidth
added 211 characters in body
Mar
23
answered Traffic shaping with tc doesn't work for high delay and bandwidth
Mar
23
comment Connectivity issues with dual NIC machine in EC2
You kind of forgot to describe the actual problem. What exactly doesn't work and what happens when you try to do it?
Mar
22
revised MegaRaid damaging disk by set a drive to “Offline”?
added 252 characters in body
Mar
22
answered MegaRaid damaging disk by set a drive to “Offline”?
Mar
20
comment How to measure UDP socket buffer loss on Windows Server 2008 R2?
There may be a way to measure some types of loss, but in general, there's no way to know what you've lost.
Mar
20
revised Mysterious swap usage on EC2
deleted 533 characters in body
Mar
20
comment Mysterious swap usage on EC2
@womble: You're right. I never noticed that. It seems the misunderstanding is on the part of the authors of top, not the OP.
Mar
20
answered Mysterious swap usage on EC2
Mar
19
comment Slow performance over network (Ubuntu)
So the question is -- what was the limiting factor. It could be that the flooder's CPU was maxed. It could be that the network bandwidth was maxed. It could be that the flooding code is very latency sensitive and so the increase in latency compromised its throughput. But this begs the question -- why optimize flooding? Was your server still responsive while it was being flooded?
Mar
19
comment Slow performance over network (Ubuntu)
What do you mean by "the throughput dramatically decreases"? Do you mean for other users trying to use the service while it's being flooded?