destination nat and masquerading

... command: Gateway(config)#access-list permit 10.10.10.0 0.0.0.255 Step Define the NAT translation from inside list to outside pool To define the NAT translation, use the ip nat inside source command: ... outside interfaces with respect to NAT To this, use the ip nat inside or ip nat outside command: Gateway(config)#interface fastethernet Gateway(config-if)#ip nat inside Gateway(config-if)#interface ... = = Step 12 Verify NAT / PAT Statistics a To view the NAT and PAT statistics type the show ip nat statistics command at the privileged exec mode prompt b How many...

Ngày tải lên: 27/10/2013, 08:15

... command: Gateway(config)#access-list permit 10.10.10.0 0.0.0.255 Step Define the NAT translation from inside list to outside pool To define the NAT translation, use the ip nat inside source command: ... respect to NAT To this, use the ip nat inside command: Gateway(config)#interface fastethernet Gateway(config-if)#ip nat inside Step 11 Testing the configuration a Turn on debugging for the NAT process ... Gateway(config-if)#ip nat outside From the workstations, ping 172.16.1.1 If the ip nat outside statement was entered correctly there should be output from the debug ip nat command e What does the NAT* : S=10.10.10.?...

Ngày tải lên: 27/10/2013, 08:15

... command: Gateway(config)#access-list permit 10.10.10.0 0.0.0.255 Step Define the NAT translation from inside list to outside pool To define the NAT translation, use the ip nat inside source command: ... outside interfaces with respect to NAT To this, use the ip nat inside or ip nat outside command: Gateway(config)#interface fastethernet Gateway(config-if)#ip nat inside Gateway(config-if)#interface ... = = Step 12 Verify NAT / PAT Statistics a To view the NAT and PAT statistics type the show ip nat statistics command at the privileged exec mode prompt b How many...

Ngày tải lên: 11/12/2013, 13:15

... command: Gateway(config)#access-list permit 10.10.10.0 0.0.0.255 Step Define the NAT translation from inside list to outside pool To define the NAT translation, use the ip nat inside source command: ... respect to NAT To this, use the ip nat inside command: Gateway(config)#interface fastethernet Gateway(config-if)#ip nat inside Step 11 Testing the configuration a Turn on debugging for the NAT process ... Gateway(config-if)#ip nat outside From the workstations, ping 172.16.1.1 If the ip nat outside statement was entered correctly there should be output from the debug ip nat command e What does the NAT* : S=10.10.10.?...

Ngày tải lên: 11/12/2013, 13:15

... source and destination “Interface-specific rules (Source rules)” on page 47 and “Interface-specific rules (Destination rules)” on page 48 Source rules define the selected interface as the source Destination ... firewall, and NAT Traffic—logs the creation or removal of flows and conversations Policy manager—logs firewall processes and the creation of rules and policies Firewall—logs how the firewall handles ... network The filters are defined by • • • • • protocol ID direction source and destination IP addresses source and destination port TCP connection establishment You create a list of rules for a...

Ngày tải lên: 13/12/2013, 09:15

... Describe the features and operation of NAT on Cisco routers • Use Cisco IOS commands to configure NAT, given a functioning router • Use show commands to identify anomalies in the NAT configuration, ... v2.0—6-17 Using the debug ip nat Command Router#debug ip nat NAT: s=192.168.1.95->172.31.233.209, d=172.31.2.132 [6825] NAT: s=172.31.2.132, d=172.31.233.209->192.168.1.95 [21852] NAT: s=192.168.1.95->172.31.233.209, ... [6826] NAT* : s=172.31.1.161, d=172.31.233.209->192.168.1.95 [23311] NAT* : s=192.168.1.95->172.31.233.209, d=172.31.1.161 [6827] NAT* : s=192.168.1.95->172.31.233.209, d=172.31.1.161 [6828] NAT* :...

Ngày tải lên: 06/03/2014, 15:20

Ngày tải lên: 12/03/2014, 20:41

... 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

... addresses/ports only Policy NAT uses both source and destination addresses/ports Note: All types of NAT support policy NAT except for NAT exemption (nat access−list) NAT exemption uses an access ... enable policy NAT Policy NAT allows you to identify local traffic for address translation by the specification of the source and destination addresses (or ports) in an access list Regular NAT uses ... policy NAT in that the ports are not considered With policy NAT, you can create multiple NAT or static statements that identify the same local address as long as the source/port and destination/ port...

Ngày tải lên: 05/07/2014, 23:50

... mạng nội Router(config-if)# ip nat inside - Xác định interface kết nối bên Router(config-if)#ip nat outside Ví dụ: NAT Overload Giới thiệu NAT Overload dạng Dynamic NAT, thực ánh xạ nhiều địa private ... Router(config)#ip nat inside sourece static 10.1.1.2 172.69.68.10 Router(config)#interface Ethernet Router(config-if)#ip nat inside Router(config)#interface serial Router(config-if)#ip nat outside Dynamic NAT ... (public) định trước gán cho host bên mạng (private) Cấu hình Dynamic NAT - Các câu lệnh dùng dynamic NAT Router(config)#ip nat pool name start_ip end_ip { netmask netmask | prefix-length prefix-length...

Ngày tải lên: 22/07/2014, 04:21

... of Contents Chapter 4: NAT and Packet Mangling with iptables A Short Introduction to NAT and PAT (NAPT) SNAT and Masquerade DNAT Full NAT (aka Full Cone NAT) PAT or NAPT NAT Using iptables Setting ... 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 ... 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...

Ngày tải lên: 08/08/2014, 21:21

... send data • Destination Port: The port number used by the receiving host to receive data • Length: The number of bytes in header and data • Checksum: Calculated checksum of the header and data fields ... 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

... on the NAT router (e.g 2143), and whenever a request comes from the Internet with the destination IP address 217.156.123.3 and the destination port 2143, the NAT router rewrites the destination ... not initiated by 192.168.1.3 (this is simple destination NAT) [ 95 ] NAT and Packet Mangling with iptables In other words, full NAT is SNAT and DNAT as presented earlier This is the function ... the destination, and so we can change the source IP address if that path is outside our network (SNAT) [ 100 ] Chapter Let's have a look at this diagram to visualize how DNAT and SNAT work DNAT...

Ngày tải lên: 08/08/2014, 21:21

... Translation and IP packet mangling using netfilter/iptables We saw: • What Network Address Translation is • Types of NAT: SNAT or Masquerading, DNAT, full cone NAT • Requirements for performing NAT with ... source destination DNAT all 0.0.0.0/0 1.2.4.1 to:192.168.1.50 DNAT tcp 1.2.5.17 1.2.4.2 tcp dpt:80 to:192.168.1.100 DNAT tcp 0.0.0.0/0 1.2.4.2 tcp dpt:65521 to:192.168.1.100:22 DNAT tcp ... the source IP address 192.168.10.60 and destination 192.168.20.60 Linux Router looks in its PREROUTING chain and matches the rule that says to change the destination IP address to 192.168.1.60...

Ngày tải lên: 08/08/2014, 21:21

... ############# Begin the NAT table operations ###### #Flush all the rules in the nat table $IPT -t nat -F #Load some modules needed for NAT /sbin/modprobe ip _nat_ ftp /sbin/modprobe ip _nat_ irc #DNAT the gaming ... 0.0.0.0/0 0.0.0.0/0 destination When an IP packet arrives into the Linux router, in the nat table the PREROUTING chain is analyzed first If the packet arrives on eth0 and has the destination UDP port ... IPT=/sbin/iptables ############# Begin the NAT table opperations ###### #Flush all the rules in the nat table $IPT -t nat -F #SNAT sales and accounting to port 53 UDP (DNS) $IPT -t nat -A POSTROUTING -o eth0...

Ngày tải lên: 08/08/2014, 21:21

... DROP #Dnat port 1433 - SQL server $IPT -t nat -A PREROUTING –s 1.1.4.1 -p tcp dport 1433 -j DNAT to $PREFIX.2 #NAT $IPT $IPT $IPT $IPT all to -t nat -t nat -t nat -t nat the internet Don't nat ... 0/0 -j DROP #Dnat port 1433 - SQL server $IPT -t nat -A PREROUTING –s 1.1.4.1 -p tcp dport 1433 -j DNAT to $PREFIX.2 #NAT all to the internet Don't nat to network at HQ $IPT -t nat -A POSTROUTING ... all Rules $IPT –F #Flush all the rules in the nat table $IPT -t nat -F #Load some modules needed for NAT /sbin/modprobe ip _nat_ ftp /sbin/modprobe ip _nat_ irc [ 178 ] Chapter #deny SSH access except...

Ngày tải lên: 08/08/2014, 21:21

... ########## NAT table ######## #Flush Nat Rules $IPT -t nat -F #load some modules for nat to work better /sbin/modprobe ip _nat_ ftp /sbin/modprobe ip _nat_ irc #MASQ internal departments $IPT -t nat -A ... 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...

Ngày tải lên: 08/08/2014, 21:21

... engineers realize there's a problem, afterwards finding out the destination IP address of the flood and actually filtering the destination IP address So, when dealing with DDoS attacks in a network ... software bugs, and technical support from producers • Well-known and well-defined technical limitations • Standard protocol implementations • High market value of the network and the following ... building a good and secure firewall is to design the network in an intelligent way, identify points of security, and understand how packets are flowing through the network When designing and deploying...

Ngày tải lên: 08/08/2014, 21:21

... add command 75 ip addr command 75 ip addr del command 75 ip addr flush dynamic command 75 ip link command 75 ip monitor command 75 ip tunnel command 75 network configuration 74 rtacct command 75 ... flowid 1:100 If the customer wants to have an internet bandwidth of 512kbps and national network bandwidth of 1Mbps, but doesn't care about the national network, then the metropolitan traffic is considered ... 1.1.10.3 ports 3000 and 3001 TCP and 1.1.10.50 ports 5000 and 5001 TCP This is all we need for the PGW2200 machines We will be a bit paranoid and will deny all other traffic to and from these machines...

Ngày tải lên: 08/08/2014, 21:21

Ngày tải lên: 12/11/2013, 13:52