21,471 reputation
12449
bio website ripple.com
location Oakland, CA
age 44
visits member for 3 years, 2 months
seen yesterday

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


Aug
4
comment ethernet switch makes network down
What do each of the cables you are connecting to the switch go to? Be as precise as possible.
Aug
2
comment Why can't apache block visitors by IP address?
Maybe it's because the Directory directive is for a path that's outside of the site's root? That definitely seems like a mistake, but I'm not sure what consequences it would have.
Aug
2
comment Why can't apache block visitors by IP address?
You're 100% positive the URL contains /mysite.com/ and not a www or anything else in there?
Aug
1
comment Why can't apache block visitors by IP address?
How are you testing? What URL are you using?
Aug
1
answered UDP packet loss cause
Jul
31
comment What is the difference between a HBA card and a RAID card?
It used to be that HBAs typically didn't offload and RAID controllers always did. But then chipset manufacturers decided to announce that they had "RAID controllers" on their chipsets (even though there was no offloading) and some manufacturer decided "HBA" sounded like a cool name for their accelerators.
Jul
31
comment Why are only 16 GB of memory usable on our server?
Surely the person who performed the firmware upgrade could have. But whatever.
Jul
31
comment Why are only 16 GB of memory usable on our server?
memtest86+, Linux bootable CD, ...
Jul
31
answered What is the difference between a HBA card and a RAID card?
Jul
31
comment Why are only 16 GB of memory usable on our server?
You should have tested with some software other than Windows to determine if it was a software problem or a hardware/BIOS problem. That would have saved you some time and allowed us to rule out Windows immediately.
Jul
29
comment How to setup a VLAN that spans across both Hp 1810g and hp 2920G
It's really not clear exactly what your issue is. When you say "I fail to see a machine on the tagged vlan", what does that mean? Where are you looking from?
Jul
10
revised email sent from my server shows up as spam
deleted 18 characters in body
Jul
10
comment email sent from my server shows up as spam
@chaoskreator Yes. Since you control fluidvector.com's SPF records.
Jul
10
answered email sent from my server shows up as spam
Jul
7
answered Deleted File, Available Space Did Not Return
Jul
7
comment Why is my RAID1 read access slower than write access?
Simple answer: Read requires waiting for results, write does not.
Jul
6
comment MAC address table in Windows
First, the ARP table wouldn't even show MAC addresses associated with IP addresses unless the system had to associate them locally, which a bridge typically doesn't have to do. Second, Windows has to have a MAC address table independent of its L3 operation, otherwise it couldn't bridge Ethernet interfaces, and we know it can.
Jul
2
comment SSH tunnel speed is very slow
I'd look closely at your SSH options. Perhaps you can choose a faster encryption algorithm, for example.
Jul
2
comment Should DNS A timeout to result in permanent email failure?
When you say "host not found", are you talking about a DNS timeout? Or an authoritative statement that the host does not exist? The former should not be fatal -- DNS outages are not uncommon. The latter should be.
Jun
30
comment Changing memory allocator to Jemalloc Centos 6
You can look at /proc/<pid>/maps to see if libjemalloc.so is mapped.