Ethernet IEEE 802.3
==== Data Packet Structure ==== On a physical layer Ethernet packet consists of a preamble and a start . . . the payload. For example, 0x0800 is used for an IPv4 protocol and 0x0806 for ARP. The length of the . . .
3K - last updated 2016-11-14 05:07 UTC by 6215
How to automate Kubernetes cluster build in Openstack using a Heat (HOT) template
This article further enhances Kubernetes cluster build process described in How to build a Kubernetes . . . = 1 net.ipv6.conf.default.disable_ipv6 = 1 net.ipv4.ip_nonlocal_bind = 1 yum_repos: pulp-system: baseurl: . . . = 1 net.ipv6.conf.default.disable_ipv6 = 1 net.ipv4.ip_nonlocal_bind = 1 yum_repos: pulp-system: baseurl: . . . /opt/keepalived sysctl net.ipv4.ip_nonlocal_bind=1 systemctl enable keepalived . . . firewall-cmd --permanent --direct --add-rule ipv4 filter IN_public_allow 0 -p tcp --dport 2379 -m . . .
42K - last updated 2023-03-29 08:31 UTC by 6215
How to automate Kubernetes cluster build in Openstack using a Heat HOT template
This article further enhances Kubernetes cluster build process described in [[How to build a Kubernetes . . . = 1 net.ipv6.conf.default.disable_ipv6 = 1 net.ipv4.ip_nonlocal_bind = 1 yum_repos: pulp-system: baseurl: . . . = 1 net.ipv6.conf.default.disable_ipv6 = 1 net.ipv4.ip_nonlocal_bind = 1 yum_repos: pulp-system: baseurl: . . . /opt/keepalived sysctl net.ipv4.ip_nonlocal_bind=1 systemctl enable keepalived . . . firewall-cmd --permanent --direct --add-rule ipv4 filter IN_public_allow 0 -p tcp --dport 2379 -m . . .
43K - last updated 2020-02-11 01:10 UTC by 6215
How to build a Kubernetes cluster in Openstack for orchestrating Docker containers
"Kubernetes is a portable, extensible open-source platform for managing containerized workloads and services, . . . vi /etc/sysctl.conf net.ipv4.ip_nonlocal_bind = 1 sysctl net.ipv4.ip_nonlocal_bind=1 . . . firewall-cmd --permanent --direct --add-rule ipv4 filter IN_public_allow 0 -p tcp --dport 2379 -m . . . firewall-cmd --permanent --direct --add-rule ipv4 filter IN_public_allow 0 -p tcp --dport 2380 -m . . . firewall-cmd --permanent --direct --add-rule ipv4 filter IN_public_allow 0 -p tcp --dport 6443 -m . . .
20K - last updated 2019-06-12 23:56 UTC by 6215
How to build docker containers
I build essential containers for statistical analysis tools, mainly for R, RStudio Server, Shiny Server . . . firewall-cmd --permanent --direct --add-rule ipv4 filter IN_public_allow 0 -p tcp --dport 80 -m . . . firewall-cmd --permanent --direct --add-rule ipv4 filter IN_public_allow 0 -p tcp --dport 443 -m . . .
16K - last updated 2023-11-22 14:24 UTC by 6215
How to install elasticsearch, kibana and fluentd in k8s
k8s cluster provides a convinient environment for elastic search cluster fronted with redundant kibana . . . cluster.name: "es-cluster" network.host: "_eth0:ipv4_" node.store.allow_mmap: false discovery.type: . . . internalTrafficPolicy: Cluster ipFamilies: - IPv4 ipFamilyPolicy: SingleStack ports: - port: 443 . . .
17K - last updated 2023-03-29 08:54 UTC by 6215
IPfilter
This is how to setup ipfilter in Solaris 10 1. Create configuration files in /etc/ipf and enable ipfilter . . . ipf -D -T fr_statesize=100003 -E # routeadm -e ipv4-forwarding -u # svcadm enable ipfilter # ipf -T . . .
7K - last updated 2009-02-10 15:04 UTC by arkadi
IPv4
IPv4 is Internet Protocol version 4, deployed for production in ARPANET in 1983. The latest IETF standard . . . which in their turn might be further fragmented. IPv4 packet structure: || Version (4 bits) || Header . . . sender. This feature is used by traceroute. === IPv4 addresses === Initially the first octet was used . . . scheme lacked the flexibility and to overcome IPv4 address pool exhaustion, Classless Interdomain . . . RFC 5737]]) || ||192.88.99.0/24 ||IPv6 to IPv4 relay (includes 2002::/16) ([[https://tools.ietf.org/html/rfc3068 . . .
5K - last updated 2016-12-03 23:38 UTC by 6215
IPv6
Internet Protocol version 6 is defined by [[https://tools.ietf.org/html/rfc2460 RFC 2460]] published . . . in 1998, 15 years after the first deployment of IPv4. The main advantage is the address length - 128 . . . bits or 4 times longer than IPv4. Other enhancements: * Stateless address autoconfiguraion . . . was developed originally for IPv6 but adopted by IPv4 * Broadcast address is not defined. Multicasts . . . used instead, which is analogous to 224.0.0.1 IPv4 group. * Multicasts are globally routable * Privacy . . .
3K - last updated 2016-12-03 23:41 UTC by 6215
Layer 3
=== IP === * [[X.25]] * [[IPv4]] * [[IPv6]] * [[IPsec]] === Routing Protocols === There are three classes . . .
2K - last updated 2016-12-05 12:37 UTC by 6215
Monitoring k8s cluster with Prometheus
Traditionally servers are monitored with Icinga, Nagios, Prtg, etc. Kubernetes though is more convinient . . . firewall-cmd --permanent --direct --add-rule ipv4 filter IN_public_allow 0 -p tcp --dport 8080 -m . . . firewall-cmd --permanent --direct --add-rule ipv4 filter IN_public_allow 0 -p tcp --dport 30800 . . . firewall-cmd --permanent --direct --add-rule ipv4 filter IN_public_allow 0 -p tcp --dport 9100 -m . . . firewall-cmd --permanent --direct --add-rule ipv4 filter IN_public_allow 0 -p tcp --dport 30091 . . .
21K - last updated 2023-11-22 14:21 UTC by 6215
Quagga BGP routing
This is how to setup bgp routing on Solaris 10 with quagga. For more information see http://www.quagga.net/ . . . ! log file /var/log/bgpd.log # routeadm -e ipv4-routing -s ipv4-routing-daemon=/usr/sfw/sbin/bgpdstart . . . # routeadm -s ipv4-routing-stop-cmd=/usr/sfw/sbin/bgpdstop # routeadm . . . {{{ !!! access-list <name> [permit|deny] <ipv4-network> <- optional access list - traffic will . . .
4K - last updated 2009-02-10 15:31 UTC by arkadi
Setting access point on Raspberry Pi 4 running Ubuntu 18.04 bionic
This scenario will bridge wlan0 and eth0 interfaces. eth0 is connected to Internet and wlan0 will be . . . br_netfilter == Enable IPv4 forwarding and optionally disable IPv6 vi /etc/sysctl.conf . . . = 1 net.ipv6.conf.wlan0.disable_ipv6 = 1 net.ipv4.ip_forward = 1 == Restart reboot . . .
3K - last updated 2021-05-08 03:58 UTC by 6215
SPF
=== Email Domain Authorization === Sender Policy Framework (SPF) is a DNS-based mechanism to authorize . . . Do not use - slow and not reliable! # "ip4:<ipv4_address/mask>" - designated mechanism that matches . . . if sender's IPv4 matches the ip_address or a range of IPv4. # "ip6:<ipv6_address/mask>" . . . not use) %{v} = the string "in-addr" if <ip> is ipv4, or "ip6" if <ip> is ipv6 %{h} = HELO/EHLO domain . . .
4K - last updated 2017-06-22 02:58 UTC by 6215
UDP
User Datagram Protocol is Internet standard defined by [[https://tools.ietf.org/html/rfc768 RFC 768]]. . . . connecting to servers Checksum is optional in IPv4 and mandatory in IPv6. When used in IPv4, it uses . . .
2K - last updated 2016-12-03 23:43 UTC by 6215
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