22,408 reputation
12451
bio website ripplelabs.com
location Oakland, California
age 45
visits member for 3 years, 7 months
seen 7 hours ago

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


7h
comment Server high memory and cpu - no leads
That really doesn't mean much. If there's no evidence of excessive I/O caused by memory pressure, I'd investigate the CPU usage.
1d
comment Server high memory and cpu - no leads
The amount of memory paged out seems microscopic, less than 1GB on a machine with 32GB of RAM. That could be perfectly normal. I'd focus on the CPU usage unless/until you have better evidence that memory pressure is a problem.
2d
comment Does TCP's MSS hide a mismatched intra-LAN MTU?
I guess it depends on the implementation. MTU black hole detection is usually implemented as well.
2d
comment Does TCP's MSS hide a mismatched intra-LAN MTU?
That won't cause path MTU discovery to fail, but it will cause fragmentation to fail, possibly breaking applications that don't use path MTU discovery.
2d
comment Does TCP's MSS hide a mismatched intra-LAN MTU?
The terminology of your question suggests that MTU's of unrelated connections are supposed to match and that there's some problem if they don't.
2d
comment Proliant DL160SE G6 motherboard - would it POST without any fan connected?
What cooling do you have on the CPU?
Mar
25
comment configure two routers to one T1
Punch T1 failover switch into your favorite search engine.
Mar
24
comment Route programming to allow a separate subnet on a 2nd NIC to connect through the 1st NIC's internet connection
Do you have control over the device that gives Internet access for the 192.168.128.0/24 network? If not, you'll need to do more than route -- you'll need to do NAT.
Mar
22
comment The Router Mac Address
@MRTgang We only know what you tell us. Your question asks for a way "to do that", but doesn't even explain what "that" is. If you're having trouble with a particular web site or service of some kind, why not talk to the support staff or administration for that service, rather than asking other people to guess what some unspecified site or service might or might not do.
Mar
22
comment The Router Mac Address
What do you mean by "a site"?
Mar
18
comment Cisco IOS - terminate a process (kill a process)
Pretty sure this is only possible with IOS XR.
Mar
15
comment troubleshooting out of memory error messages from mysql
The problem is virtual memory, not RAM. You need a 64-bit OS, not so that you can use more than 4GB of RAM (though that will be nice), but so that your processes can use more than 3GB of virtual memory.
Mar
10
comment What if you set your static IP to that of Google?
BGP is probably the most important one to understand. Note that pretty much nothing a typical user can do will have any effect on their ISP's BGP activity. It is very, very important to understand that routing on the Internet is policy driven -- it doesn't take the shortest path but the one that's paying for the service.
Mar
2
comment Apache starts up with high memory usage. Why?
It's really not clear what you're asking about. What specifically in all that output concerns you? Are you asking about physical memory or virtual memory? And which indications do you think are "high" and why?
Feb
27
comment modem rejects logon credentials If I try to connect through http://modem/. works fine if I connect with http://<ipaddr>/
It's not clear, at least to me, what your specific question is. I have all kinds of answers I could give you, but I have no idea which one is the one you're looking for. (If it's "what should I do next", the obvious next step is to confirm that it's the Host header that's the relevant difference.)
Feb
25
comment Is it possible to find a computer's physical location in a room?
It depends on the precise details of the hardware you're working with and what kind of access you have. For example, if they have USB ports and you can deploy software to them, you can deploy a program that causes a system to alert you (say, by email) when a new USB device connects to it. Then just attach a USB flash drive to each machine in turn, keeping track of the connection order.
Feb
21
comment passenger-memory-stats doesn't show Private memory consumption
Likely your operating system doesn't track what memory usage is private.
Feb
16
comment Remove SSL warning with internal websites, with Chrom
@MikeMestnik The client has to additionally verify that the certificate is appropriate for the URL specified. Just knowing that the cert was issued by the CA is insufficient, as an attacker can easily get a cert (and matching key) signed by a trustworthy CA. This question is dealing with those appropriateness checks, not certificate validity checks.
Feb
13
comment Is there any reason to keep the power option on default “Balanced” instead of “high performance”?
You are incorrect that the only negative effect is the electricity bill. There are several other negative effects that come from the additional heat produced and temperatures of the components, including an increased risk of performance loss due to thermal throttling. (And the CPU may not be the only component that thermally throttles.)
Jan
26
comment Apache accepting requests to other servers?
Welcome to the Internet. Everyone who operates a server on the Internet has to have a strategy for dealing with the "baseline noise" that pretty much all Internet servers see.