TIL: IGMP

January 6, 2017 | Comments

Today I learned about IGMP, which stands for Internet Group Message Protocol. There are three different ways packets are sent out to other devices. There’s unicast, which just sends a packet to one specific device. Then there’s broadcast, which sends packets to all the devices that is in the network. Lastly, there’s multicast. Multicast sends packets to more than one device but not all the devices. If a device wants to be part of a multicast group, it sends out an IGMP packet, or more specifically, an IGMP join packet.

Category: Networking
Tags: #igmp

TIL: Adding Policies in Cisco Firewalls

January 5, 2017 | Comments

Identify traffic with an access-list access-list acl-name permit ip source destination dscp dscp-value Apply the access-list with the dscp value to an interfact class-map match-all interface match ip dscp dscp-value Apply the policy policy-map map-name class class-name [bandwidth bandwidth-value] [priority priority-level] set ip dscp dscp-value Today at work I was going over firewalls. We want to check the configuration of the firewalls and compare them to our QoS standards. I’m not too familiar with how policies and QoS are implemented on Cisco devices so it was pretty interesting to learn.

Category: Networking
Tags: #firewalls #work

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