Newest Questions
16,963 questions
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Ethernet Speed on work HP Laptop painfully slow [closed]
I am using VPN Wireguard over a router in Country A which connects to Wireguard router in country B to access internet.
When I plugin in the (same cable and USB Adapter) to my surface pro, I get speed ...
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2
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1
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91
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Pseudo Header In Layer 4
Why we need pseudo header when calculating the layer 4 protocol checksum ?
Because in layer 3 we already have a checksum to calculate only the layer 3 header checksum, and why we also need to ...
- 129
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0
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Should my WAN Ethernet Port be in the WAN or LAN firewall zone with a PPPoE WAN Connection?
I have a zone-based firewall configuration with WAN, LAN, and LOCAL zones (LOCAL being the zone for the router itself).
My WAN connection is via a PPPoE modem (a DrayTek Vigor 130). It has a static IP ...
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1
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40
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How to extend current home network to span 2 subdomains? [closed]
I currently have a 192.168.7.0/24 network, but I am approaching 200 devices on it (mostly IOT automation doodads), Id like to spill over into the next subdomain over (192.68.8.0), for this from what I ...
- 101
2
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1
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299
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Difference between GRE over Ipsec and Ipsec over GRE
What I have learnt is that whenever protocol X is encapsulated inside another protocol Y, then we say protocol X over protocol Y. eg: we say video over http or text over http, that's because video/...
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1
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287
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Connect two Fiber Optic Cables using Patch Cord?
Good day! In the attached image, AB fiber segment and BC fiber segment are terminated using LIUs. Data Servers are at Location A.
One way to inter connect AB and BC segments is by fusing a pair of ...
- 121
2
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1
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66
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Sonicwall NAT pooling / PAT / SNAT / state table exhaustion
TLDR: Is the following the correct way to configure a NAT public address pool on a Sonicwall? This is also called Port Address Translation, Source Network Address Translation, or Many-to-Many NAT by ...
- 327
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106
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IP Phones Stuck on "Configuring CM List" Despite TFTP and DHCP Setup on Cisco Router (Fixed)
I have a network where IP phones and PCs are connected to L2 switches, which connect to a router and L3 switches. The L3 switche links to a DHCP server and a router which I want to give out directory ...
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2
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1
answer
106
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Cat cable pairs' twist rate and how that affects crosstalk
I understand that more twists result is a cleaner signal because the crosstalk is reduced, but how is the rate of twist affecting the physical properties of the wire pair themselves to reduce that ...
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5
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885
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How can routing protocols such as OSPF and RIP use the network layer
I am currently reading the the network layer chapter in Kurose & Ross Computer Networking: a top down approach. I understand that one of the responsibilities (services) of the network layer is to ...
1
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41
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Does wiping the IOS on a Cisco AIR-CT5760-100-K9 Wireless Controller remove the AP licenses?
I’m new here, so please bear with me if I miss any details or conventions. I’m seeking some clarification regarding Cisco wireless controllers and their licensing.
I recently purchased a refurbished ...
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2
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1
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127
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Checksum In layer 3 and layer 4
I'm little curious about the checksums in the IPv4 header and transport layer protocol.
I have 2 questions:
(1). Does the layer 3 checksum in the ipv4 protocol calculate the checksum of ipv4 header + ...
- 129
1
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1
answer
86
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DHCP Relay Issue: Router Can Ping DHCP Server, but End Devices Cannot Obtain IP Address - Packet Tracer
I’m setting up a network where multiple subnets share a single DHCP server. The router can ping the DHCP server, but end devices connected to the router cannot obtain an IP address. Here’s my setup ...
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4
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1
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114
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OSPF Adjacency Issue Between a Physical and a Virtual Layer 3 Switch
I'm encountering a puzzling issue with OSPF adjacencies in a mixed network environment and would greatly appreciate any insights or suggestions.
Network Setup:
Devices Involved:
A Cisco 2900 router.
...
2
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1
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183
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Management VLAN
You can see the topology in the picture below. I’ve configured the management VLAN on the switch to be VLAN 999 to separate the management traffic from user traffic. I’ve also configured SVI 999 with ...
