Archive for September 17th, 2025
Fed Chair Jerome Powell – speaks after Federal Reserve cuts key rate by quarter-point
Mittwoch, September 17th, 2025Villa Schöpflin und Stiftung – hat ein neues Programm ‚freii‘ entwickelt das Jugendlichen dabei hilft der Onlinesucht zu begegnen und digitale Medien bewusster zu nutzen
Mittwoch, September 17th, 2025
Mittwoch, September 17th, 2025
Milliarden-Finanzlücke droht Autobahnprojekte zu verzögern https://t.co/SVtEb1UxqL
— Autobahn Online (@autobahn_online) September 17, 2025
BMW Panoramic iDrive with BMW Operating System X – get a first up-close look at the new user interface and user experience
Mittwoch, September 17th, 2025President Donald J. Trump and the First Lady – Participate in a St. George’s Chapel Visit
Mittwoch, September 17th, 2025without further churchgoers from the English people ...
Oberverwaltungsgericht für das Land Nordrhein-Westfalen – hat zwei Kliniken im Rheinland im Streit um den Nordrhein-Westfalen Klinikplan recht gegeben
Mittwoch, September 17th, 2025Linux Parameter ‚tcp_keepalive_time‘ – sets the idle time (in seconds) a TCP connection must remain inactive before the kernel starts sending keepalive probes to check if the other end is still responsive and the default value is 7.200 seconds (2 hours)
Mittwoch, September 17th, 2025The tcp_keepalive_time is part of a three-parameter system:
tcp_keepalive_time – the initial idle time before the first probe is sent (default: 7.200 seconds)
tcp_keepalive_intvl – the interval (in seconds) between subsequent keepalive probes if the previous one doesn’t receive an acknowledgment (default: 75 seconds)
tcp_keepalive_probes – the number of failed probes after which the connection is considered broken and is closed (default: 9)
root@pve-ubuntu-01:~# sysctl net.ipv4.tcp_keepalive_time net.ipv4.tcp_keepalive_intvl net.ipv4.tcp_keepalive_probes
net.ipv4.tcp_keepalive_time = 7200
net.ipv4.tcp_keepalive_intvl = 75
net.ipv4.tcp_keepalive_probes = 9
root@pve-ubuntu-01:~#
Change temporarily for testing:
root@pve-ubuntu-01:~# sysctl -w net.ipv4.tcp_keepalive_time=900 # Sets the time to 15 minutes
root@pve-ubuntu-01:~# sysctl -a | grep keep
net.ipv4.tcp_keepalive_intvl = 75
net.ipv4.tcp_keepalive_probes = 9
net.ipv4.tcp_keepalive_time = 900
net.ipv6.conf.all.keep_addr_on_down = 0
net.ipv6.conf.default.keep_addr_on_down = 0
net.ipv6.conf.eth0.keep_addr_on_down = 0
net.ipv6.conf.lo.keep_addr_on_down = 0
Always set keepalive less than firewall timeout with intvl and probes tuned for your use case