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IT technical memo of networking

Apply VIB Patch from ESXi6.5 Web Client

VMware releases patches from time to time within each major version. Conventionally, in a standalone environment without vCenter, it was necessary to install VIB (VMware Infrastructure Bundle) with esxcli. However, since ESXi 6.5 has WebGU…

Distribute the multiple output in Logstash

In Logstash, since the configured Config becomes effective as a whole, it becomes a single output setting with a simple setting. Therefore, it is possible to set multiple outputs by conditionally branching according to items with if. Based…

Multiple output settings in Logstash same as Fluentd forest + copy

In Logstash, try setting the same as Fluentd (td-agent) forest plugin and copy combined. As a result, even if the log type and the sender increase, it is possible to simplify without adding the output setting every time. What to expect - S…

Visualize Elasticsearch's data with Grafana

Kibana is available as a log visualization tool for Elasticsearch, but sometimes I want to create a dashboard with Grafana by combining data such as ZABBIX. As a starting point, describe how to link Elasticsearch as Grafana’s data source. …

Visualize the Cisco ASA FW log with Fluentd (td-agent)

Visualize the Cisco ASA FW log with Fluentd (td-agnet), which is popular as a log collection tool. Logs received by Fuentd are indexed by ElasticSearch and visualized by Kibana. Fluentd plugin and settings Since there was a developer who h…

Kibana5 export search result of Discover tab to CSV

One of the functions that is hardly implemented while being requested by Kibana is export from the Discover screen. Github also has long been requested as an issue. github.com Among them, there are some people who provide function implemen…

Cisco ASA Series does not support CDP/LLDP

Since the Cisco ASA is a security device, It does not support CDP/LLDP which collects information on neighboring NW devices. Information on the Cisco Support Community Several questions on ASA's CDP/LLDP compliance status are being made. T…

Reason why Dot11Radio is reset in the Cisco AIR1131AG

A problem occurred in the home lab’s wireless AP Cisco Aironet AIR1131AG, in which the status of the Dot11Radio interface became reset after recovery from a power outage. The cause of the blackout was due to excess power supply capacity of…

Check the status of DNS name resolution with Express + Node.js

I created a DNS name confirmation confirmation tool in Express + Node.js for API cooperation between servers. Since name resolution is performed on Node.js on the server, it is possible to check in the same environment as the actual applic…

Security level setting when building DMZ with ASA

I am building a DMZ in my home lab with the Cisco ASA 5505. In the case of a simple inside-outside setting, set the security level to inside: 100, outside: 0 and allow traffic from outside by FW and NAT. However, inclusion of the DMZ makes…

Can not communicate from DMZ to inside at home lab ASA

I had trouble communicating from the DMZ to the inside when I built a DMZ with ASA 5505 in my home laboratory. Components Cisco ASA 5505 (BASE License, Ver.9.2 (3)) Cisco Catalyst 2960 VMware ESXi Because ASA 5505 can not use VLAN trunk wi…

Ansible slow/delayed reason and settings to be confirmed

When I started using Ansible, the operation became slow when the setting amount became large. I solved the problem by dividing it, so make a note of the confirmation point. (CentOS 7.3 ansible 2.2.1.0) As a result, waiting for DNS timeout …

AND/OR mixed sorting rules in Outlook

When setting the sorting rule in Outlook, AND / OR combination can not be done well if it is the usual setting. I will introduce the recommended settings especially when you want to use the OR condition. Microsoft Community There is a simi…

Correspondence table between Ubuntu OS version and kernel version

Ubuntu is one of the major distributions of Linux and has a wide share in desktop applications. When installing various software, it is necessary to pay attention to the version of kernel in addition to the version of the OS itself. The co…

Express + Node.js GET the other site responce

I sometimes want to check whether the published server is accessible from other server, and created a simple program with Express + Node.js. By doing this, you can check that you can not do it by itself, such as access confirmation to the …

HTTP communication of Node.js is recommended to use then-request (sync-request is deprecated)

As introduced in this article, the sync-request module can perform HTTP communication by synchronous processing. This makes simple code without callback processing by asynchronous processing peculiar to javascript. However, on the sync-req…

CANNOT issue certificates of multi domain and wild card

When implementing HTTPS (SSL), examination of certificates is also required. When publishing many sites, there are many FQDNs, but you can reduce the number of certificates by using wild card certificates, multi domain (SANs) certificates.…

SSH to CentOS with Chromebook Secure Shell public key authentication

With Secure Shell provided with Chromebook (Google Chrome), you can run Linux (CentOS) server without TeraTerm on Chromebook. In this procedure, switching to developer mode is unnecessary. Generate public key When generating a public key o…

Install CentOS 7.3 on ESXi 6.5 (VM console problem??)

Install CeontOS 7.3 on VMware vSphere ESXi 6.5. Use the free (Essential) version of ESXi. Unfortunately, since vCenter can not be used at no charge, it is a standalone configuration. For the guest OS use the Linux distribution CentOS. Sinc…

Resolve VLAN nameif setting error with ASA 5505 of basic license

With the basic license, the Cisco ASA 5505 can set up to three VLANs. However, if you try to set it normally, you will get an error when setting nameif in the third VLAN. Describe how to resolve the error and set nameif in the third VLAN. …

Cisco AIR1131AG IOS switch from centralized to autonomous

Cisco Aironet is one of wireless APs popular in the enterprise. Since AIR1131AG is also exhibited in second-hand market, it is easy to introduce it to home network. There are many centrally controlled types by WLC in the enterprise, and ma…

How to proceed with local domain SSL certificates

Used as internal domain (Internal Domain Name) .Local. In many cases it uses local domains such as test.local and test.internal. Describe the problem of "How to do SSL certificate" which is one of problems occurring while using local domai…

Cisco ASA FW log (syslog) with Papertail

Cloud log management service Papertrail. Minimal features are available for free, making it ideal for managing FW logs etc in home labs. Also, since it is not necessary to construct a syslog server, it is highly effective even in verificat…

How to deal with garbled characters where Japanese is displayed in \xx in Git Bash

When using widely used version management tool Git on Windows, use Git for Windows (Git Bash). When handling Japanese files, describe the correspondence between garbled characters that are displayed as \xx (backslash, \mark number). Instal…

Can I use vCenter Server for free? I would like to have a cluster at home ESXi

(This article is information as of December 2016) Since I purchase additional home server and two ESXi will be configured, I considered installing vCenter Server. Basically, for verification purposes as a home lab, I am considering using i…

Home server selection - Make cheap virtualization environment

I thought that I would like to replace my server at home, I made various selections and summarize it. The current environment is as follows. DELL PowerEdge SC 440 CPU: Core 2 quad Q6700 2.66 GHz Memory: 8 GB DISK: Western Digital (WD) HDD …

Configure wildcard DNS on Windows Server

PaaS such as Cloud Foundry generally routes to the CF Router with wildcard DNS, then it will route HTTP from the host of the FQDN within the CF. We will show you how to configure wildcard DNS with the DNS server function of Windows Server …

Verify Windows Server 2016 for free (upgrade from TP 4)

As introduced in this article, Windows Server can be used free of charge for free for 180 days as an evaluation version. Windows Server Free Usage (2016 Technical Preview 4) - designetwork(EN) Windows Server TP4 has already expired, and yo…

Nest virtualization failed with VT-x is not available error

VMware ESXi (vSphere) is not officially supported, but you can use nested virtualization for verification. Using this, I thought of installing Ubuntu (Linux) as a guest OS of ESXi, and using VirtualBox within it. Eventually I wanted to use…

PCF Dev(Cloud Foundry) install to Home LinuxVM

Cloud Foundry has a wide market share as PaaS infrastructure software. Pivotal Cloud Foudry, one of its commercial distributions, is also widely used in commercial services. Cloud Foundry is composed of many components and requires a large…


This Blog is English Version of my JP's.

Sorry if my English sentences are incorrect.

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