Secure IT

How to configure Site-to-Site VPN on Cisco ASA? Access-Lists Add the ACLs which we will need to NAT, the encryption domain and the group policy. access-list Example_Policy_ACL extended permit tcp object-group Local_LAN object-group Remote_LAN eq 80 access-list Example_Policy_ACL extended deny ip any any access-list Example_VPN_ACL permit ip object-group Local_LAN object-group Remote_LAN Group Policy Create your group policy which will restrict traffic between hosts within your encryption domain. group-policy Example_Policy internal group-policy Example_Policy attributes vpn-filter value Example_Policy_ACL default-group-policy Example_Policy NAT Add your No NAT for traffic within the encryption domain nat (outside) 0 access-list Example_VPN_ACL Tunnel Group Create your tunnel group which will include your pre-shared key. tunnel-group [Peer IP] type ipsec-l2l tunnel-group [Peer IP] general-attributes default-group-...

What is difference between DoS vs DDoS attacks? In a Denial of Service (DoS) attack, a hacker uses a single Internet connection to either exploit a software vulnerability or flood a target with fake requests—usually in an attempt to exhaust server resources (e.g., RAM and CPU). On the other hand, D istributed Denial of Service (DDoS) attacks are launched from multiple connected devices that are distributed across the Internet. These multi-person, multi-device barrages are generally harder to deflect, mostly due to the sheer volume of devices involved. Unlike single-source DoS attacks, DDoS assaults tend to target the network infrastructure in an attempt to saturate it with huge volumes of traffic. DDoS attacks also differ in the manner of their execution. Broadly speaking, DoS attacks are launched using homebrewed scripts or DoS tools (e.g., Low Orbit Ion Canon), while DDoS attacks are launched from botnets—large clusters of co...

How to modify SSH/HTTP/Telnet time out in Cisco ASA firewall? By default tcp idle timeout is 1:0:0 hh:mm:ss. If in case you need to modify it you can do it by MPF (Modular Policy Framework). Let us setup a custom timeout when traffic is coming from particular host 10.77.241.129. !— Match the traffic using the access-list —! object-group service DM_INLINE_TCP_1 tcp port-object eq www port-object eq ssh port-object eq telnet access-list outside_mpc extended permit tcp host 10.77.241.129 <source ip> any object-group DM_INLINE_TCP_1 !— Define the class map Cisco-class –! class-map Cisco-class match access-list outside_mpc !— Call this class-map into policy map and set the connection reset after 10 min when traffic is coming from particular host —! policy-map Cisco-policy class Cisco-class set connection timeout idle 0:10:00 reset !— Apply the policy-map Cisco-policy on the interface. —! service-policy Cisco-p...

How to setup the internet access through the Cisco ASA firewall? Basic Guidelines for setting Internet through the Cisco ASA firewall: At first we need to configure the interfaces on the firewall. !— Configure the outside interface. interface GigabitEthernet0/0 nameif outside security-level 0 ip address 10.165.200.226 255.255.255.224 !— Configure the inside interface. interface GigabitEthernet0/1 nameif inside security-level 100 ip address 10.1.1.1 255.255.255.0 The nameif command gives the interface a name and assigns a security level. Typical names are outside, inside, or DMZ. Security levels are numeric values, ranging from 0 to 100, used by the appliance to control traffic flow. Traffic is permitted to flow from interfaces with higher security levels to interfaces with lower security levels, but not the other way. Access-lists must be used to permit traffic to flow from lower security levels to higher security l...

How to enable multiple context in the Cisco ASA firewall Cisco ASA firewall is possibly already configured for multiple security contexts dependent upon how you ordered it from Cisco, but if you are upgrading then you might need to convert from single mode to multiple mode. The context mode (single or multiple) is not stored in the configuration file, even though it does endure reboots. If you need to copy your configuration to another device, set the mode on the new device to match with the mode command. When you convert from single mode to multiple mode, the security appliance converts the running configuration into two files: a new startup configuration that comprises the system configuration, and admin.cfg that comprises the admin context (in the root directory of the internal Flash memory). The original running configuration is saved as old_running.cfg (in the root directory of the internal Flash memory). The original startup ...