Linux on Blog - uTIcARdI

tc-How it work on different IPs

Fri, 22 Sep 2017 00:00:00 +0000

#!/bin/bash
interface=eth0
ip1=192.168.1.1
ip2=172.16.1.1
delay1=100ms
delay2=200ms
tc qdisc add dev $interface root handle 1: prio
tc qdisc add dev $interface parent 1:1 netem delay $delay1 10ms 25%
tc filter add dev $interface parent 1: protocol ip prio 1 u32 match ip dst $ip1 flowid 1:1
tc qdisc add dev $interface parent 1:2 netem delay $delay2 10ms 25%
tc filter add dev $interface parent 1: protocol ip prio 2 u32 match ip dst $ip2 flowid 1:2

Adding Realtek 8139 Driver to ESXi6

Tue, 29 Nov 2016 00:00:00 +0000

Note: This is not an official guide, backup is required before you apply the driver.

My Dell PC has two NICs:

Intel I217-LM
Realtek RTl-8139

and #2 Realtek 8139 is not supported by VMware EXSi.

There are some guides about customizing EXSi installation ISO to support the NIC, but I’m trying to find a way to apply the driver without reinstall EXSi.

Here is a page which contains many NIC drivers: https://vibsdepot.v-front.de/wiki/index.php/List_of_currently_available_ESXi_packages

SNMP simulator installation guide

Wed, 13 Nov 2013 00:00:00 +0000

About SNMP Simulator

The the SNMP Simulator software is intended for testing SNMP Managers against a large number of SNMP Agents that represent a potentially very large network populated with different kinds of SNMP-capable devices.

Refers to its project page for more info.

Why?

With SNMP simulator you can simulate a device by the output of SNMPwalk without considering MIB files.

This article is about how to install SNMP Simulator.

Install Python

Open LDAP and SSH Public key

Fri, 08 Nov 2013 00:00:00 +0000

The article is about how I setup Open LDAP on CentOS6 for SSH public key authentication.

1.Download and install CentOS6.2

CentOS-6.xx-i366-minimal.iso

2. CentOS configuration

Network: IP address, DNS, and restart network service

vi /etc/resolv.conf/DNS
vi /etc/sysconfig/network-scripts/ifcfg-eth0/NIC IP
vi /etc/networks//Route
/etc/init.d/network restart

configure host file
```
vi /etc/hosts
```
Modify 127.0.0.1 item to FQDN format because openldap get dc from the item automatically.
```
127.0.0.1 ldap.kzblog.com
```
Stop security services
```
setenforce permissive
getenforce
service iptables stop
```
Note: This only for the testing environment.

make error :/usr/bin/ld: cannot find -luuid

Tue, 05 Nov 2013 00:00:00 +0000

I met a make error in CentOS 6:

# make

......

/usr/bin/ld: cannot find -luuid
 ld returned 1 exit status
make: *** Error 1

The way to fix this error is to install lib : uuid-devel

yum -y install libuuid-devel