firewalls and proxy servers

... login prompt and stored up the username and password It then turned around and used a modified version of telnet to connect to well.sf.ca.us and passed packets back and forth between it and Frank’s ... Gina 1-27-96 CH06 LP#3 IP Spoofing and Sniffing Do not confuse the rexec commands (rexec and rcmd) with the r-commands The rexec daemon waits for a username and cleartext password to authenticate ... need to understand the network segments and trust between computer systems Network Segmentation A network segment consists of a set of machines that share low-level devices and wiring and see the...

Ngày tải lên: 20/12/2013, 22:15

... simplify network management This version of Windows 2000 is ideal for file and print servers, Web servers, and workgroups, and provides improved network access Windows 2000 Server supports up to ... access and change information in Active Directory 8 Module 1: Introduction to Microsoft Windows 2000 File, Print, and Web Servers Active Directory also provides benefits for file and print servers ... existing settings, users, groups, and permissions Windows 2000 also provides significant performance enhancements for file, print, and Web servers Upgrading Existing Servers to Windows 2000 Provides...

Ngày tải lên: 17/01/2014, 08:20

... tree, expand Storage, and then click Disk Management In the details pane, right-click an NTFS volume, and then click Change Drive Letter and Path Module 3: Configuring File and Print Servers ... Creating and sharing folders Creating and configuring users and groups Setting permissions on files and folders Estimated time to complete this lab: 45 minutes Module 3: Configuring File and Print Servers ... File and Print Servers Lab A: Configuring a File Server Slide Objective To introduce the lab Lead-in In this lab, you will configure disks for a file server, and create and configure a stand-alone...

Ngày tải lên: 17/01/2014, 08:20

... Represents commands, command options, and portions of syntax that must be typed exactly as shown It also indicates commands on menus and buttons, icons, dialog box titles and options, and icon and menu ... Active Directory™ directory service and its benefits for Windows 2000 file and print servers Installing and Configuring Microsoft® Windows® 2000 File, Print, and Web Servers vii Course Timing The ... (continued) 4:45 5:30 Module 5: Enhancing File and Print Servers with Active Directory viii Installing and Configuring Microsoft® Windows® 2000 File, Print, and Web Servers Trainer Materials Compact Disc...

Ngày tải lên: 17/01/2014, 08:20

... analysis and advanced correlation and reporting on the data, helping to identify and eliminate threats and security incidents while ensuring compliance with federal and industry rules and regulations ... regulations (such as Sarbanes-Oxley and the Health Insurance Portability and Accountability Act) The number of events and the amount of data that Security Manager can handle far exceed the capabilities ... but on a wide range of host systems and applications This information can be consolidated and reported on, ensuring compliance with federal and industry rules and regulations Syslog Security Deficiencies...

Ngày tải lên: 21/01/2014, 02:20

... wrong VLAN, and thus the wrong DMZ segment (which may create an inadvertent security risk) Although you can mitigate this by paying careful attention to detail and having well-documented and well-followed ... (VACLs) to provide a means of filtering traffic at Layer 2, and thus within the VLAN, to further protect resources Virtual Firewalls Virtual firewalls build upon the practice of using VLANs After ... interface Virtual firewalls are most commonly implemented by separating a single firewall into multiple logical firewalls, sometimes referred to as security contexts Virtual firewalls are also...

Ngày tải lên: 21/01/2014, 02:20

... cho máy khách kết nối Internet trực tiếp trường hợp này, tất kết nối bên cho qua nhiều proxy kết nối Proxy Servers Caching Caching trang web cải thiện chất lượng dịch vụ mạng theo cách Thứ nhất, ... Chia sẻ kết nối với Proxy Server Nhiều sản phẩm phần mềm dành cho chia sẻ kết nối mạng gia đình xuất số năm gần Mặc dù vậy, mạng kích thước lớn trung bình, proxy server giải pháp cung ... rộng Tiếp đến, cải thiện khả đáp trả cho máy khách Ví dụ, với HTTP proxy cache, Web page load nhanh trình duyệt web Cuối cùng, proxy server cache tăng khả phục vụ Các Web page dòng khác cache khả...

Ngày tải lên: 15/03/2014, 06:20

... between the Application layer and the Transport layer, monitoring TCP handshaking between packets from trusted clients or servers to untrusted hosts, and vice versa The proxy server is still an intermediary ... application layer proxy is transparent • Opaque – the local party must configure client software to use the proxy • client software must be proxy- aware software • Netscape proxy server is opaque ... real connection between the client and server, a regular proxy can’t be used • Windows Media Player, Internet Relay Chat (IRC), or Telnet • Circuit-level proxy servers were devised to simplify...

Ngày tải lên: 29/03/2014, 15:20

Ngày tải lên: 27/06/2014, 20:20

... deployment onto individual hosts and home networks 2.2.1 Host-Based Firewalls and Personal Firewalls Host-based firewalls for servers and personal firewalls for desktop and laptop personal computers ... glossary and an acronym and abbreviation list, respectively Appendix C lists print and online resources that may be of use in gaining a better understanding of firewalls 1-2 GUIDELINES ON FIREWALLS AND ... application -proxy gateway firewalls Many dedicated proxy servers are application-specific, and some actually perform analysis and validation of common application protocols such as HTTP Because these servers...

Ngày tải lên: 14/12/2021, 16:35

... and module are all used interchangeably Module Event Handler Whenever a KLD is loaded into or unloaded from the kernel, a function known as the module event handler is called This function handles ... sysctl You can also dispense with module handlers if you wish and just use SYSINIT and SYSUNINIT directly to register functions to be invoked on load and unload, respectively You can’t, however, ... unloads, and will return with an error (EOPNOTSUPP)2 on shutdown and quiesce 1.2 The DECLARE_MODULE Macro When a KLD is loaded (by the kldload(8) command, described in Section 1.3), it must link and...

Ngày tải lên: 03/07/2014, 16:06

... attempted Packet Filtering Address Filtering • Firewalls can filter packets based on their source and destination addresses and port numbers Network Filtering • Firewalls can also filter specific types ... alarm was generated and a present condition should be alarmed An alarm was NOT generated and there is no condition present diti t to warrant one False An alarm was generated and there is no condition ... between the two networks, which is usually a private network and a public network such as the Internet Firewalls protect against hackers and malicious intruders What does a Firewall A firewall examines...

Ngày tải lên: 12/07/2014, 14:20

Ngày tải lên: 14/12/2021, 18:42

... Designing and Implementing Linux Firewalls and QoS using netfilter, iproute2, NAT, and L7-filter Learn how to secure your system and implement QoS using real-world scenarios ... mother, and my sister—I love you very very much Many thanks go to the team at Globtel who were like second family to me, to my girlfriend for understanding me and standing by me, to Louay and the ... computer network Linux-based firewalls besides being highly customizable and versatile are also robust, inexpensive, and reliable The two things needed to build firewalls and QoS with Linux are two...

Ngày tải lên: 08/08/2014, 21:21

... DNS uses UDP for handling DNS requests from clients Think about a very large network that usually has two or three DNS servers If TCP was used to handle DNS requests, the DNS servers would have ... and RARP are found at both the Internet and network access layers Also, you can see that the TCP/IP network access layer contains LAN and WAN technologies that are found at the OSI physical and ... theoretical model and it is very useful in the learning process On the other hand, the Internet was built on the TCP/IP model, and so, TCP/IP is the most popular due to its usage and its protocols...

Ngày tải lên: 08/08/2014, 21:21

... and routing tc stands for traffic control, and it is used to implement QoS Before digging into tc commands, we learned a bit of theory on classless and classful queuing disciplines The best and ... those bands as follows: • Packets in the band have the highest priority • Packets in the band are sent out only if there aren't any packets in the band [ 77 ] Firewall Prerequisites: netfilter and ... limit, hash table size options (hardcoded in original SFQ) and hash types • Random Early Detection and Generic Random Early Detection (RED and GRED): qdiscs suitable for backbone data queuing, with...

Ngày tải lên: 08/08/2014, 21:21

... Proxy Transparent proxy is a way to force users to use a proxy server, even if their browsers are configured not to You probably know about the benefits of using a proxy server— [ 105 ] NAT and ... not very pleased about using our proxy server, and they usually remove it from their browser configuration We can force them to use the proxy server anyway If the proxy server listens on port 3128 ... Transparent Proxy #Allow the boss to bypass the proxy server [ 107 ] NAT and Packet Mangling with iptables $IP –t nat –A PREROUTING –s 192.168.1.50 –p tcp –-dport 80 –j ACCEPT #Do transparent proxy...

Ngày tải lên: 08/08/2014, 21:21

... children's computer and the desktop to have a 256kbps each, and we also want to leave them the possibility to use the entire bandwidth when it's available; and for the laptop and friends, we will ... for transparent proxy and how to set up access lists In our case, the same Squid proxy server must the following: • Be used as transparent proxy • Deny dangerous files (.pif and scr) for the ... transparent proxy for the children's computer and deny access to porn sites and some viruses Squid can be found at www.squid-cache.org, and is the most widely used proxy server under Linux—most distributions...

Ngày tải lên: 08/08/2014, 21:21

... web-based mail servers Building the Firewalls We have a pretty clear image of what we need to here We will start with the firewalls for sites B and C, which are the simplest Sites B and C The network ... free bandwidth in its parent class We will move next to limiting the bandwidth for the executive department For them, we will create a 2Mbps CBQ class and two child classes, one of 512Kbps and ... #attach root qdisc and create the root class for eth3 tc qdisc add dev eth3 root handle 30: cbq bandwidth 100Mbit avpkt 1000 tc class add dev eth3 parent 30:0 classid 30:1 cbq bandwidth 100Mbit...

Ngày tải lên: 08/08/2014, 21:21

... that it uses a 'control' port and a 'data' port FTP runs only on TCP, and by standard, it uses port 21 (FTP) for control (connecting and issuing commands to the server) and port 20 (FTP data) for ... Information Rate, and it's the minimum guaranteed bandwidth, and MIR means Maximum Information Rate, and it's the maximum bandwidth a user can get We will show in this example how to make bandwidth allocation ... the firewalls Designing and Implementing the Firewalls Due to the fact that all the servers run Linux, they will all have their own firewall However, the main firewall is on the core router, and...

Ngày tải lên: 08/08/2014, 21:21