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In this article, we’ll look at the following topics:

• IP Precedence bits
• Random Early Detection (RED)
• Committed Access Rate (CAR)
• Some Cisco QoS Links

The IP Precedence bits allow us to specify what traffic gets what Class of Service. RED lets us selectively drop TCP packets to throttle the sender, providing better goodput. And CAR is input-side traffic admission control, allowing us to police inbound traffic.

IP Precedence Bits

Part of the new IP QoS tool kit in routers and switches is the IP Precedence bits. Devices at the edge of the network may classify traffic as deserving a certain Class of Service using these bits. Core devices can then use the bits to provide differing types of service to different flavors of traffic.

Mikrotik Fetch Tool is one of the tools on the console/terminal Mikrotik RouterOS that works to copy (copy) files through FTP, HTTP, and https protocol. This Fetch tool can copy files from other devices to Mikrotik Router (download) or copy files from Mikrotik Router to other devices (upload). So its use is similar like wget on linux, with the different command.

Until RouterOS version 6.38.1, Mikrotik fetch tool still no fetch menu in its Winbox GUI. So to use this fetch tool we still have to type the command on Mikrotik terminal. It does not matter because the use of his command will be discussed one by one in this Mikrotik Tutorial until easy to understand.

What Is QoS?

QoS stands for Quality of Service. The term is being used by Cisco to refer to IP-based features that allow specification and delivery of services much like the Quality of Service features in ATM.

When you get right down to it, there isn’t all that much a router can do to control traffic, since it is not the originator of most of the traffic. The router can drop traffic — although we’d prefer it didn’t do so. It can put some queued frames out an interface before others. It can be selective about accepting traffic — another form of dropped traffic. And, with TCP, it can selectively drop the occasional packet as an indirect signal to slow down. With cooperative hosts, the router can try to accept reservations and hold bandwidth for applications that need it.

If you are in the informatics sector, it is impossible for you to come to a point where the Mikrotik router does not come.

There are two important points here.

1 – Bridge behind a Mikrotik modem (Username password is defined in Mikrotik)

2 – It is accessible from the outside as a DMZ / NAT behind a Mikrotik modem.

In both methods, a WAN IP belonging to the Mikrotik device (this is the local IP in option 2.) I also assume that there is a LAN IP (Local, camera, office IP, etc).

OSPF Network Type

Please also read the previous article  OSPF and Route Summarization– Part II

OSPF has three network types:

• Broadcast networks (Ethernet, Token Ring, FDDI)
• Nonbroadcast multiaccess networks (SMDS, Frame Relay, X.25, Classic IP Over ATM)
• Point-to-point networks (HDLC, PPP)

You can configure an interface as any type you wish.

Broadcast is typically used on networks where broadcast and multicast are supported. The idea is to send out one OSPF multicast that reaches multiple receivers. This can be appropriate with X.25 and Frame Relay if you have a full mesh of PVC’s. Loss of a PVC can cause problems with OSPF broadcast networks, however, since some routers with a common subnet will no longer be able to transmit directly to each other.