by Mehdi SFAR | Mar 1, 2024 | Blog
Have you ever found yourself in need of decrypting ESP packets nested within UDP encapsulation using Wireshark, especially when dealing with setups similar to those found in Cisco SD-WAN? Wireshark automatically performs this action for NAT-T UDP 4500 destination...
by Mehdi SFAR | Feb 11, 2024 | Blog
Consider a scenario where your network architecture features two redundant CE routers linked to two PE routers. In this setup, the PE routers are configured to transmit only the default route to the CE routers, particularly beneficial for Branch routers, which...
by Mehdi SFAR | Feb 4, 2024 | Blog
Here is how the CBWFQ (Class-Based Weighted Fair Queueing) allocation mechanism is described on Cisco website : “If excess bandwidth is available, the excess bandwidth is divided amongst the traffic classes in proportion to their configured bandwidths. If not...
by Mehdi SFAR | Jan 1, 2023 | Blog
In network design, it is important to consider every aspect of the design process, whether it involves creating a new network from scratch, adding new technology, making changes to existing elements, merging or diverging networks, replacing technology, or adding new...
by Mehdi SFAR | Dec 30, 2022 | Blog
Here is how IP fragmentation works: A Router receives a large IP packet that exceeds the MTU of its egress interface. The router divides the packet into smaller fragments, each with a size that is equal to its interfaces MTU egress interface. The router sets the...
by Mehdi SFAR | Dec 15, 2022 | Blog
There are plenty of documents online discussing Multipath BGP, but few seem to address the need for using eiBGP for load sharing (ie. eBGP and iBGP at the same time). Overview of the topics covered in this review: Why and when do we need eiBGP Multipath The pros...
