19,883 reputation
11943
bio website ripple.com
location Northern California
age 44
visits member for 2 years, 8 months
seen 1 hour ago

I am Chief Cryptographer at Ripple Labs (formerly OpenCoin) and one of the architects of the Ripple payment system.


Oct
27
comment Linux restrict a telnet and rs323 user to only run a few programs
@JonathanHenson: No, because you can run programs outside your path by specifying the full path to those programs.
Oct
27
awarded  Mortarboard
Oct
27
comment Windows Server 2008 R2 Metafile RAM Usage
Exactly. If the OP reduced the RAM usage of the metafile, the system would have to load more metadata from disk since less of it would be in memory, making things worse.
Oct
27
answered Is there a router for “personal wireless” space at my office connected to a hardline?
Oct
27
comment Any benefit or detriment from removing a pagefile on an 8GB RAM machine?
@Mehrdad: The problem is, with no page file, there's a lot of data that must be kept in RAM even though it will likely never, ever be accessed. Consider, for example, any memory allocated by a process that started on system startup but offers a service that will not be used for days. The system cannot prove the data won't be accessed and it has no place other than RAM to keep it. So the disk cache shrinks while data is kept in RAM that hasn't been accessed for days.
Oct
27
comment Equivalent to denyhosts, but for HTTP requests?
@David: The 200 just means he gave them back a page. It's most likely an error page (though not an HTTP error) that says the request could not be understood or the like. (Because he's not running versions of those scripts that are vulnerable, but the scripts exist.)
Oct
27
comment Equivalent to denyhosts, but for HTTP requests?
Wouldn't this open you up to a nasty denial of service attack? If I access a URL on your ban list, anybody else using the same proxy as me now can't reach your site.
Oct
27
comment Windows Hyper-V Server suddenly unable to resolve some URLs
By the way, commands to keep in mind for testing are nslookup smtp.critsend.com. 195.235.228.93 (easy output to understand) or dig @195.235.228.93 smtp.crtisend.com. (lots of details).
Oct
27
answered Windows Hyper-V Server suddenly unable to resolve some URLs
Oct
27
answered Directory disappear after “mv”
Oct
27
comment Any benefit or detriment from removing a pagefile on an 8GB RAM machine?
@Mehrdad: I'm not sure why you see that, but what I see is that pretty much all available RAM is used as cache. For example, the box I'm on right now (Win 7, 64-bit, 8GB of RAM) is doing typical desktop work. 385MB is free, 5,440MB is cached. This is as it should be. Free RAM is wasted RAM. You might as well hold data that's also on disk -- it can help (if you wind up needing it) and it can't hurt (you can always throw it away when RAM is scarce).
Oct
27
comment Any benefit or detriment from removing a pagefile on an 8GB RAM machine?
Plus the point, what's the good of having 8GB if you have to live in constant fear of actually using it?!
Oct
27
comment Any benefit or detriment from removing a pagefile on an 8GB RAM machine?
@Mehrdad: Because you don't want to have to keep 50% of your RAM free. Sure, you could do that, but you would lose 50% of the physical RAM you could be using as a disk cache for active data. Free RAM is a sign of inefficiency, it's like FedEx trucks at a depot instead of on the road. It means you're not moving as much freight as you could because you're spending too much time loading and unloading.
Oct
27
comment Disk buffer: why does it even exist in many disk controllers?
A RAID controller controls the disks in a RAID array, typically with specialized hardware to accelerate the RAID operations.
Oct
27
comment Can I buy just one SSL cert for a subdomain?
In other words, in most realistic cases, you actually can't do this.
Oct
27
revised Disk buffer: why does it even exist in many disk controllers?
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Oct
27
answered Disk buffer: why does it even exist in many disk controllers?
Oct
27
revised Will everyone having Globally Accessible IP's in IPv6 be kind of a security nightmare?
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Oct
27
comment Why do some filesystems out there have imaps to imaps to imaps (multiple imaps)?
@KaitlynMcmordie: You can find full details on ZFS internal structures in this PDF.
Oct
27
answered Will everyone having Globally Accessible IP's in IPv6 be kind of a security nightmare?