At T1 seconds (typically set to 0.5*lease_time) after the last successful renewal, the DHCP client attempts to renew it’s lease with the DHCP server that granted it’s current address via unicast. If unsuccessful, at T2 seconds (typically set to 0.875*lease_time) after the last renewal, the DHCP client attempts to rebind with any DHCP server via multicast.
SFP+ interface compatibility settings with 1G links
For MikroTik devices with SFP+ interface that support both 10G and 1G link rate following settings are needed to be set on both linked devices for required interfaces. In order to get them working in 1G link rate.
auto-negotiation disabled
port speed 1G
FD
Devices which SFP+ ports support 1G links:
All SFP+ interfaces can be used in 1G mode if required:
Set the PCC selector from “both addresses and ports” to “both addresses”. This way communication from and to the same IP address always hashes the same and you don’t get broken connections.
You can get the below help when pressing these keys in an OpensSSH session:
Enter
~
?
So thats Enter, followed by tilde, then question mark.
Then you get this help:
Supported escape sequences:
~. - terminate connection (and any multiplexed sessions)
~B - send a BREAK to the remote system
~C - open a command line
~R - request rekey
~V/v - decrease/increase verbosity (LogLevel)
~^Z - suspend ssh
~# - list forwarded connections
~& - background ssh (when waiting for connections to terminate)
~? - this message
~~ - send the escape character by typing it twice
(Note that escapes are only recognized immediately after newline.)
The one I use most is below; it leaves my tmux session alone.
The records represent the largest and most complete set of DEC records in existence, dating from 1947 through 2002, with the bulk from the company’s years of operation from 1957 through 1998, when they were bought by Compaq Computer. The collection is a comprehensive technical history of every major computing innovation at DEC, as well as its nontraditional business culture, which still serves as an industry model—nearly every contemporary company strives for a “culture of innovation.” The processing of the collection presents an extraordinary opportunity to study DEC’s product lines and business practices in depth as was never before possible. Very few companies as influential as DEC have as long a history, and the breadth and depth of this collection makes it unique in its comprehensiveness.
Boy, I totally missed that this was introduced back then in Firebird 2.0:
In Firebird 2 and higher, you test for null-encompassing equality with DISTINCT. This has already been discussed, but here’s a quick recap. Two expressions are considered:
DISTINCT if they have different values or if one of them is NULL and the other isn’t;
NOT DISTINCT if they have the same value or if both of them are NULL.
[NOT] DISTINCT always returns true or false, never NULL or something else. Examples:
The Wiert Corner - irregular stream of stuff 