Networking/Computing Tips/Tricks

Network Administrators often need to deploy new Access Control Lists or Firewall rules based on items they see and learn in packet captures. Wireshark makes this task very simple by providing commands in various formats that can be easily cut and paste into routers or Firewalls.

Let's see how this is done. First with a capture open, click on the packet that has the information you are interested in. For example, if we have a particular user that we want to ban from the network, we select the packet to highlight it:

Now click on Tools> Firewall Rules:

The following dialogue appears:

Note the default is Cisco IOS standard, and that the access list command syntax has appeared in the main window.

Lets look at some of the options. Note that Inbound traffic is default. Also note that Deny is default.

Click on the "Product" down arrow to see the product types supported:

Now click on the "Filter" down arrow. This allows you to select various packet related items such as MAC or IP or TCP port:

The network administrator can now easily cut and paste the command line into their Firewall or Router to implement the control.

Thank you Wireshark! Comments are welcome.

Comments powered by CComment

Find by Tag

4G Networks 5G Networks 6LoWLAN 6LoWPAN 802.11 802.11ah 802.11ax 802.11ay 802.11az Addressing Analysis Ansible Architecture ARP Assessment AToM Automation Baseline BGP Bloom's Taxonomy Cable cat CellStream Cellular Central Office Cheat Sheet Chrome Cisco Cloud CMD Computer Consulting Data Center Data Networking Dependencies DHCPv6 DNS Docker Documentation Dublin-Traceroute dumpcap Earth Earthquakes ECMP Ethernet Ethics Etiquette Evaluation Field Operations Fragmentation G-MPLS Gauge GeoIP Git GNS3 Google GQUIC Hands-On History Home Network ICMP ICMPv6 IEEE 802.11p IEEE 802.15.4 India Internet IoT IPsec IPv4 IPv6 IRINN IS-IS L2VPN L3VPN LDP Linux LLN LoL M-BGP MAC Macro Microsoft mininet Monitoring MPLS mtr MTU Multicast Murphy Name Resolution Netcat NetMon netsh Networking nmap NSE Observations Online School OpenFlow OSPF OSPFv2 OSPFv3 OSX OTT Paris-Traceroute Parrot PIM PMTU Policy POTS POTS to Pipes PPP Profile Project Management PW3E QoS QUIC Railroad Remote Desktop Requirements Resume Review RIP Routing RPL RSVP Rural SDN Security Service Provider Small Business SONET Speed SSH SSL Status Storms Subnetting SYSCTL T-Shark TCP TCP/IP Telco Telecom 101 Telecommunications Telephone termshark Testing TLS Tools Traceroute Traffic Engineering Training Travel Tunnel Ubuntu Utility Video Virtualbox Virtualization VoIP VRF VXLAN Wi-Fi Wi-Fi 4 Wi-Fi 5 Wi-Fi 6 Windows Wireless Wireless 5G Wireshark WLAN Writing Zenmap ZigBee

Twitter Feed