Unicast - IT Networking Pro Today

OSPF Adjacency Issue Between a Physical and a Virtual Layer 3 Switch

Network Engineering

FEBRUARY 1, 2025

When I reconfigure the virtual switch to use non-broadcast (unicast) hello packets, the OSPF adjacency is successfully formed. Packet captures show that the physical switch is not receiving the multicast OSPF hello packets (sent to 224.0.0.5) from the virtual switch.

Routers

Routers Unicast Topology Network

Sflow on Nexus returning faulty interface values

Network Engineering

APRIL 10, 2025

I found sFlow does not support egress sampling for multicast , broadcast, or unknown unicast packets. In my opinion the Cisco documentation is not really clear if this behavior is expected or not. For NX-OS 10.5 But the NX-OS 7 documentation states: Egress sFlow of multicast traffic requires hardware multicast global-tx-span configuration.

Port

Port Unicast Network Networking

EP141: How to Ace System Design Interviews Like a Boss?

ByteByteGo

DECEMBER 7, 2024

Unicast vs Broadcast vs Multicast vs Anycast How Does VISA Make Money? Unicast vs Broadcast vs Multicast vs Anycast These are 4 network communication methods you must know. Unicast Unique sender and a single receiver. Save your spot This week’s system design refresher: How to Ace System Design Interviews Like a Boss?

Unicast

Unicast Banking Protocol Network

Simple Precision Time Protocol at Meta

Engineering at Meta

FEBRUARY 7, 2024

While deploying Precision Time Protocol (PTP) at Meta, we’ve developed a simplified version of the protocol (Simple Precision Time Protocol – SPTP), that can offer the same level of clock synchronization as unicast PTPv2 more reliably and with fewer resources.

Protocol

Protocol Unicast Data Centers Server

SOLVED - Quanta LB6M Trunk and Vlan

Network Engineering

FEBRUARY 27, 2024

10.1.0.240 vlan database vlan 31 vlan name 31 "ADOPT" exit ip ssh server enable ip ssh protocol 2 sshcon timeout 160 configure sntp client mode unicast sntp client port 123 ! set prompt "QUANTA LB6M" network protocol none network parms 10.1.212.244 255.255.0.0

Port

Port Unicast Routers Server

IPv6 Buzz 076: Even More Listener Questions!

Packet Pushers

MAY 20, 2021

Are there caveats to using IPv6 Global Unicast Addresses (GUAs)? Are there caveats to using IPv6 Global Unicast Addresses (GUAs)? Today's IPv6 Buzz podcast answers these and other listener questions. Where does IPv6 fit in to the Zero Trust model of network security?

Unicast

Unicast Firewall Network Security Network

CCNA: Address Resolution Protocol (ARP)

The Network DNA

JULY 16, 2024

Remember PC-2 knows the MAC address of the PC-1 when responding to ARP Request, so ARP Response is NOT broadcast, it is Unicast communication between PC-2 and PC-1. PC-2 knows about the PC-1 MAC address from the SMAC value of the ARP request that it received from PC-1. PC-1 maps the IP address 1.1.1.2 with 0x4a::56.

Protocol

Protocol Ethernet IP Address LAN

Introduction to VXLAN MP-BGP EVPN Route Types

The Network DNA

JULY 5, 2024

Route Type 3: Broadcast, Unknown Unicast, and Multicast (BUM) traffic delivery via EVPN networks requires Type 3 routes. To guarantee that data packets take the most effective route through the network, each component makes a fine-grained contribution to the identification, routing, and segregation of traffic.

IP Address

IP Address Ethernet Advertising Routers

How Precision Time Protocol is being deployed at Meta

Engineering at Meta

NOVEMBER 21, 2022

We implemented a scalable PTPv2 unicast PTP server in Go, which we named ptp4u , and open-sourced it on GitHub. The PTP network PTP protocol The PTP protocol supports the use of both unicast and multicast modes for the transmission of PTP messages.

Protocol

Protocol Server Unicast Network

Understanding Network Class Address in IP Networking

NW Kings

DECEMBER 11, 2024

Class D addresses are not used for standard unicast communication but rather for multicast transmission, allowing a single packet to visit multiple destinations. The first three bits of the first octet are 110, which limits the number of hosts per network but allows for many networks. Class D Address (Multicast) Range : 224.0.0.0

IP Address

IP Address Network Networking Internet

VRF Leak global default route with a single router

Network Engineering

JANUARY 27, 2022

0 route-map GLOBAL_TO_VRF_CUSTA permit 10 match ip address prefix-list GLOBAL_TO_VRF_CUSTA ip vrf CUSTA rd 64513:1 import ipv4 unicast map GLOBAL_TO_VRF_CUSTA route-target both 64513:1 exit interface GigabitEthernet1/0.1000 description CUSTA Internet PtP encapsulation dot1Q 1000 ip vrf forwarding CUSTA ip address 1.2.3.4 31 0.0.0.0

Routers

Routers Unicast VPN IP Address

Dual ISP with default route setup

Network Engineering

APRIL 15, 2025

remote-as 1500 description ** eBGP peer with ISP-1 ** address-family ipv4 unicast send-community send-community extended neighbor 192.168.1.1 remote-as 65535 address-family ipv4 unicast send-community send-community extended [Border-Leaf] router bgp 65001 router-id 10.254.1.2 This is how my topo will look end of the day.

Unicast

Unicast Routers Networking Network

M-LAG: After migrating the VLAN, network accessibility is limited to one switch

Network Engineering

MARCH 25, 2025

arp proxy enable arp proxy inter-vlan enable arp proxy intra-vlan enable mac-address 0000-5e00-0101 dhcp server enable dhcp select relay dhcp relay binding server group ad-dhcp-srv dhcp relay source-interface Vlanif203 interface MEth0/0/0 ip address 10.197.1.101 255.255.255.0 255.255.255.0 255.255.255.0 24 0.0.0.0 24 0.0.0.0 10.197.203.0/24

IP Address

IP Address Unicast Network Networking

MikroTik -> Huawei M-LAG: After migrating the VLAN, network accessibility is limited to one switch

Network Engineering

MARCH 25, 2025

arp proxy enable arp proxy inter-vlan enable arp proxy intra-vlan enable mac-address 0000-5e00-0101 dhcp server enable dhcp select relay dhcp relay binding server group ad-dhcp-srv dhcp relay source-interface Vlanif203 interface MEth0/0/0 ip address 10.197.1.101 255.255.255.0 255.255.255.0 255.255.255.0 24 0.0.0.0 24 0.0.0.0 10.197.203.0/24

IP Address

IP Address Unicast Advertising Network

Simplify allowlist management and lock down origin access with Cloudflare Aegis

CloudFaire

MARCH 20, 2025

How requests are routed with Aegis A few terms, before we begin: Anycast: a technology where each of our data centers announces and can handle the same IP address ranges Unicast: a technology where each server is given its own, unique unicast IP address Dedicated egress Aegis IPs are located in a particular set of specific data centers.

IP Address

IP Address Data Centers Port Unicast

IT Networking Pro Today

OSPF Adjacency Issue Between a Physical and a Virtual Layer 3 Switch

Sflow on Nexus returning faulty interface values

Trending Sources

EP141: How to Ace System Design Interviews Like a Boss?

Simple Precision Time Protocol at Meta

SOLVED - Quanta LB6M Trunk and Vlan

IPv6 Buzz 076: Even More Listener Questions!

CCNA: Address Resolution Protocol (ARP)

Introduction to VXLAN MP-BGP EVPN Route Types

How Precision Time Protocol is being deployed at Meta

Understanding Network Class Address in IP Networking

VRF Leak global default route with a single router

Dual ISP with default route setup

M-LAG: After migrating the VLAN, network accessibility is limited to one switch

MikroTik -> Huawei M-LAG: After migrating the VLAN, network accessibility is limited to one switch

Simplify allowlist management and lock down origin access with Cloudflare Aegis

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