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How to open a port in the firewall on CentOS or RHEL
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How to protect ssh server from brute force attacks using fail2ban
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How to open a port in the firewall on CentOS or RHEL
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How to open a port in the firewall on CentOS or RHEL
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How to open a port in the firewall on CentOS or RHEL
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How to protect ssh server from brute force attacks using fail2ban
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How to open a port in the firewall on CentOS or RHEL
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How to block unwanted IP addresses on Linux efficiently
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How to open a port in the firewall on CentOS or RHEL
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How to set up Squid as a transparent web proxy on CentOS or RHEL
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How to set up a transparent HTTPS filtering proxy on CentOS
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How to protect ssh server from brute force attacks using fail2ban
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How to configure fail2ban to protect Apache HTTP server
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How to set up a transparent HTTPS filtering proxy on CentOS
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How to configure fail2ban to protect Apache HTTP server
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How to set up a transparent HTTPS filtering proxy on CentOS
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How to block network traffic by country on Linux
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Buku “Panduan Praktis Membangun Server Email Enterprise dengan Zimbra” dan DVD-nya ini berisi tutorial dan panduan praktis membangun Zimbra Collaboration Suite, yakni aplikasi web based untuk email dan kolaborasi kerja berskala enterprise. Buku ini sangat cocok bagi Anda yang ingin menguasai server email enterprise yang didukung dengan aplikasi-aplikasi yang sangat sesuai dengan kebutuhan dunia industri dan perkantoran saat ini.
Bab pertama mempelajari konsep e-mail, pengenalan tentang Zimbra Collaboration Suite, spesifikasi sitem yang digunakan Zimbra, memahami komponen Zimbra dan paket-paket yang ada pada Zimbra. Bagian ini sangat penting untuk Anda memahami bagaimana proses email beserta aplikasi yang terkait.
Bab 2 berisi langkah-langkah persiapan instalasi Zimbra agar instalasi bisa berjalan dengan baik, langkah-langkah proses instalasi Zimbra, dan pengujian hasil instalasi Zimbra. Bab ini juga membahas port-port yang akan digunakan Zimbra, dan dan syarat-syarat yang harus dilakukan pada saat instalasi.
Bab 3 membahas administrasi Zimbra melalui browser web yang menggunakan protokol keamanan SSL (https) dengan port 7071. Bab ini juga membahas proses pembuatan domain, akun e-mail, aliases, mailing list, anti spam, anti virus, monitoring server, dan lain-lain.
Bab 4 memberikan panduan untuk pengguna mengakses Zimbra melalui web. Bab ini berisikan langkah-langkah pengiriman email, pengunaan address book, calender, task, document, briefcase, preference, pengunaan klien email klien seperti Evolution, dan lain-lain.
Bab 5 mengupas beberapa cara melakukan backup data Zimbra, seperti backup dengan perintah atau Command Line Interface, forward, dan backup dengan skrip.
Bab 6 membahas cara mengamankan Zimbra, baik bagi pengguna akhir seperti pencegahan terhadap virus, spam, dan phishing, pengamanan dari sisi otentikasi dan enkripsi, serta pengamanan dengan firewall/iptables.
Bab 7 berisi materi tambahan sebagai syarat mengelola domain sendiri yang akan digunakan oleh Zimbra, yakni membahas server DNS Bind.
On the DVD:
Paket-paket Zimbra untuk distro Linux RedHat/CentOS, Ubuntu, Debian, Fedora, dan SUSE.
Skill yang diperoleh:
Setelah membaca dan mencoba tutorial dalam buku ini, Anda akan mampu menginstal dan mengonfigurasi server email dan kolaborasi berskala enterprise dengan Zimbra Collaboration Suite beserta langkah pengamanan dan sistem backup-nya.
How to block unwanted IP addresses on Linux efficiently
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Been at RedHat Linux training for one week now and taking the exam now. If successful, I will be a RHCE (RedHat Certified Engineer). Been trained on GnuPG, iptables NAT, iSCSI, NFS, CIFS, bash, x509 certificates, virtual web hosts, firewall configurations, SELinux, etc... It will take a little while to get my head to integrate all that info into my bag of tricks for the enterprise.
How to block unwanted IP addresses on Linux efficiently
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3 Main Components
- a router
- a 6 port switch
- a wireless port
The switch's ports are divided into port 0-3 (physical LAN ports are numbered differently) for the local LAN and Port 4 for the WAN. The switch's port 5 is connected to the router's eth0 port. Port 0 to 5 add up to 6 ports.
To separate the WAN traffic from the LAN traffic, the switch is divided into virtual LANs called VLANs. VLAN0 is LAN traffic (ports 0-3) and VLAN1 is WAN traffic (port 4). Each VLAN "appears" to be a totally separate switch - that's where the virtual part comes from.
NOTE: I've labelled the tagged VLANs as eth0.0 and eth0.1 on the following diagram which is a standard way of representing VLANs as subinterfaces on eth0 in routing BUT this is not the way that dd-wrt documentation represents them. The eth0.0 represents VLAN 0 and the eth0.1 represents VLAN 1
The connection between the switch (port 5) and the router (eth0) is called a trunk. A trunk is a connection that allows multiple VLAN traffic to pass through. In order for the trunk to identify which VLAN the data belongs to, the data frame is tagged with the VLAN number. This way when frame comes out an interface, it knows which VLAN it belongs to. Tagging only exists on the trunk.
What happens to trunk traffic that is not assigned (tagged) to a VLAN? By default it is assigned to VLAN0 (called the native VLAN or default ).
Traffic between the two VLANs is controlled by the router using iptable and ip route commands. So all data going to and from the LAN to the WAN port passes through the router.
Lastly, the wireless port eth1 (because it is not part of the switch) is bridged (using br0) to VLAN0 and is treated the same as any other port of the switch.
Now the fun part is that you are able to reconfigure and reassign any port to any VLAN and then apply new rules in the router to do the most amazing things!
One last point is that some versions of the hardware have the ports numbered differently. So in the original reference, you see [] brackets to add to the confusion ot reference the other versions of hardware.
3 Main Components
- a router
- a 6 port switch
- a wireless port
The switch's ports are divided into port 0-3 (physical LAN ports are numbered differently) for the local LAN and Port 4 for the WAN. The switch's port 5 is connected to the router's eth0 port. Port 0 to 5 add up to 6 ports.
To separate the WAN traffic from the LAN traffic, the switch is divided into virtual LANs called VLANs. vlan1 is LAN traffic (ports 0-3) and vlan2 is WAN traffic (port 4). Each VLAN "appears" to be a totally separate switch - that's where the virtual part comes from.
NOTE: "ip link show" output tells that vlan1 and vlan2 are vlan interface on eth0 -> vlan1@eth0 / vlan2@eth0
The connection between the switch (port 5) and the router (eth0) is called a trunk. A trunk is a connection that allows multiple VLAN traffic to pass through. In order for the trunk to identify which VLAN the data belongs to, the data frame is tagged with the VLAN number. This way when frame comes out an interface, it knows which VLAN it belongs to. Tagging only exists on the trunk.
What happens to trunk traffic that is not assigned (tagged) to a VLAN? By default it is assigned to VLAN0 (called the native VLAN or default ).
Traffic between the two VLANs is controlled by the router using iptable and ip route commands. So all data going to and from the LAN to the WAN port passes through the router.
Lastly, the wireless port eth1 (because it is not part of the switch) is bridged (using br0) to vlan1 and is treated the same as any other port of the switch.
NOTE: bridge is like a virtual switch which does Layer 2 forwarding. Packets are forwarded based on Ethernet addresses rather than IP Addresses (like a router).
How to block unwanted IP addresses on Linux efficiently
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Challenger, Atlantis and Blackbird in that order, running Gentoo happily :)
They were all Dual Xeons with HT, 3GHz, 4 GB RAM 2x 73 GB SCSI HDDs. Challenger was our internal webserver,download mirror, Gentoo rsync & distfiles mirror. Atlantis was our gateway box handling DNS, DHCP, iptables and Blackbird was the sound encoder and was the laziest of the three.
iptables -N block
iptables -A INPUT -j block
iptables -A FORWARD -j block
iptables -A OUTPUT -p icmp -m state --state INVALID -j DROP
iptables -A block -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -A block -i ! eth1 -m state --state NEW -j ACCEPT
iptables -A block -j DROP
The first strange thing I did was a router with only one network interface card for the TeRespondo's office (connecting the internet cable into the first port of the switch and praying to the iptables works with only one NIC).
This second strange think is to connect all physical networks of my house with minimum effort, using only a cable.
The recomended configuration is: adsl---wifi----hub----desktops,
with lots of configurations, hard to configure the adsl router in need, and putting the WiFi near to the adsl, not in the middle of my appartment using only one long cable istead of two.
updated: the third thing was to install a computer without using a screen