22,408 reputation
12451
bio website ripplelabs.com
location Oakland, California
age 45
visits member for 3 years, 7 months
seen 4 hours ago

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


Jan
25
answered Why did MySQL suddenly move it's 'real' memory usage to swap and freed up the difference? img attached
Jan
25
comment FTP Transfer Very Slow When Windows Firewall Enabled
Check to see if ICMP is blocked.
Jan
24
awarded  Nice Answer
Jan
23
comment IP Address Conflict with Router/Firewall
@jwegner When you sniff ARP traffic, do you see an ARP for 192.2.40.17 from the router? Or do you not see such an ARP? (The answer to that question splits the problem space in half.)
Jan
21
comment What is the best approach to wiping all data off a HDD instantly?
The NSA uses a grenade and an enclosure specifically designed for this purpose. I really do know this from experience.
Jan
19
comment Name Server for a domain name is its own sub domain - How to do that?
The difference is that they'll need the IP addresses as well and they'll need to add glue records. When nameservers serve their own zone, you can't very well ask them for their own IP addresses. (Because you need to already know the IP address in order to query.)
Jan
19
answered Using Single Domain SSL and Wildcard SSL in parallel on different IP addresses
Jan
19
comment ssh error - bind to port 22 failed: Address already in use
@RogerTempleton Are you trying to get your router to forward connections from inside the LAN? Many routers don't do hairpin NAT. On many routers, port forwarding only applies to traffic received from the WAN.
Jan
19
comment ssh error - bind to port 22 failed: Address already in use
What does the listening socket look like? Find it in netstat.
Jan
18
answered My domain name no longer works after being transferred. How can I troubleshoot?
Jan
18
comment Memory usages in Linux drops frequently
Check your cron jobs for anything that runs at those times.
Jan
18
comment Networking several devices with the same IP
802.11Q support from the switch should be enough. You can create virtual interfaces on the device, each in their own VLAN. You can then static NAT based on which virtual interface the packet was received on.
Jan
18
answered What did i do wrong in bind settings?
Jan
18
comment Networking several devices with the same IP
What OS do you plan to use? And what hardware do you have? (Ideally, you'd have a Linux or FreeBSD box and a switch that supports VLANs and some kind of trunk between the switch and the UN*X box.)
Jan
18
comment Networking several devices with the same IP
Right, but you can have a 192.168.100.2 on each VLAN. With each device on its own VLAN, they won't conflict. You can then NAT incoming connections from 192.168.100.2 to have a different source IP depending on which VLAN sub-interface they come in on.
Jan
18
comment Why does “cat /dev/null” and “ls” take 5 seconds to load?
strace -r is your friend.
Jan
18
comment How to protect power strips from accidental shut-offs/“cleaning lady” attack?
@voretaq7: I didn't think of that. I like that better. It's easier, safer, and in the unlikely chance of some bizarre emergency, it makes it much more obvious that trying to flip the switch will not cut power.
Jan
17
answered Networking several devices with the same IP
Jan
17
comment How to protect power strips from accidental shut-offs/“cleaning lady” attack?
I can't think of any specific reason it's not safe, but I admit, I've always had a slightly uneasy feeling about it.
Jan
17
answered When an IP or a block of IPs are assigned to you, do the network admins just add them to a router?