Let’s consider, I am going to block youtube.com from my network. which means no one should be able to access youtube.com from my network. This regular expression will help you to block any of the websites you want. lets go to IP>Firewall>Layer 7 protocols Step 2 Create the firewall rule to drop the traffic of Youtube.com In the… Read More »
Step-1=Create a regular expression. Use the following script to create a layer 7 Regular expression with the name of Speed-test . Step-2= Create a firewall Mangle rule for matching the traffic of regular expression. Step=3= Create the PCQ., Here I want all users must get the 2Mbps while their actual bandwidth is 1 Mbps, which means when they… Read More »
I was troubleshooting an enterprise network for slowness the speed. So when I went through the troubleshooting steps I found that there is an IPv6 and IPv4 unknown unicast flooding that occurs in the Lan interface. it’s a medium enterprise where they have almost 400 end hosts including telephone and IP cameras as well. find the picture given… Read More »
ip prefix-list A permit 0.0.0.0/0 ge 32 The above statement will match only hosts. ip prefix-list B permit 128.0.0.0/2 ge 17 The above statement will match Any subnet in a class B address space. ip prefix-list C permit 0.0.0.0/0 le 32 The above statement will match all routes. ip prefix-list D permit 0.0.0.0/0 The above statement will match… Read More »
In the Mikrotik router board, The VLAN works in a different way compared to other vendors’ devices like Cisco, Huawei, Juniper, etc. Recently I was trying to configure the multiple trunk ports in a CCR 1036 and I wanted to pass the same VLAN on multiple trunk ports but it did not allow me to do . Here… Read More »
The Bogon filtering can be done by using static or dynamic. The disadvantage of static filtering is you have to update your filtering list on a daily basis because the bogon lists change according to the allocation of prefixes by the internet registry. As the bogon lists are very large in number it’s very difficult to configure all… Read More »
The bogon Prefixes are the type of Prefixes that are not routable on the global internet or you can say these prefixes even do not exist on the internet so these Prefixes are not allocated by IANA or any of your local internet registry (Such as AFRINIC, ARIN, APNIC, LACNIC,RIPE NCC etc etc.). A packet routed over the… Read More »
How To Calculate MTU and MSS in the Network. ? Maximum Transmission Unit (MTU) is the largest size in bytes that can be transmitted on the Ethernet. In Ethernet the default MTU of 1500 bytes. This means that a single Ethernet frame can carry up to 1500 bytes of data. On top of this data, we add the… Read More »
SMTP works on port 25 and SMTP are used for mail transmission, But SMTP itself is not secure, The main disadvantage is it can be easily hacked or spammed. There are so-called “fake emails” that are messages sent using any address (for example abc@abc.com) to any recipient. Another issue In an ISP network, Most often you may have… Read More »
Why do we need to redirect our Google DNS(8.8.8.8, 8.4.4.4, 4.2.2.2) ICMP traffic, Let me tell you about a real incident…In 2016, I was working as a consultant for One of my ISP clients and they had almost 2000 broadband users. So at first, One of their competitors made a stupid marketing strategy and said to other isp… Read More »
