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1500 questions
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2 answers

PPPoE with NAT configuration broken

We are trying to replace our existing router with a newly purchased Cisco router: GigabitEthernet0/0: PPPoE GigabitEthernet0/1: 192.168.2.1 The PPPoE is getting established perfectly, and I can ping the outside from inside CLI however, the clients…
Nick Cameo
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1 answer

How does the transport layer tell UDP apart from TCP?

So I'm reading Computer Networking: A top down approach (where these images are from) and I was looking at the Transport layer. A generic segment in the transport layer has a pretty simple structure: source port, destination port, some other header…
Lucas
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1 answer

Analyze Network Traffic by Autonomous System Number?

I'm looking for the way to take an estimate consumptions toward internet per Autonomous System Number which could help me to make a decision if it's necessary to establish a peering with this AS's company or not according the consumption. My…
Mamitiana Ra
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Does it make sense to generally "Disable TCP Checksum Offload"?

In a work sheet for PCs that we deliver to customers, I found instructions to always "Disable TCP Checksum Offload" on the NICs. Via those NICs, the PCs are connected to the customer's LAN, and it is imperative that they work without problems. The…
doppelfish
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7
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4 answers

Are multiple links with different VLANs between two switches possible?

I'm not considering Etherchannel or LACP. Given 2 Ethernet switches A and B, where both switches have port 0 configured as a tagged trunk for VLAN 100 and 101 and port 1 configured as a tagged trunk for VLAN 200 and 201. Can I connect port 0 on…
nos
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7
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2 answers

Is it possible to emulate device other than Cisco and Juniper in GNS3 or any other environment?

For testing and research purposes, I know it is possible to emulate Cisco devices (with dynamips) and Juniper ones (via an "Olive", a FreeBSD based system running on qemu) in a GNS3 environment. Is it possible to emulate other vendor devices (like…
Benjamin A.
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7
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1 answer

Why do we have authentication before association in 802.11

Why does client authenticate before associating with the AP. What does open system authentication even achieve. I fail get an accurate reason from my web searches. Best reason I do get is unlike wired medium there is no concept of physical port in…
Ganapathi Bhat
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7
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1 answer

Is the first address of the subnet a valid configurable address in case of IPv4 and IPv6 point to point networks?

Am I correct, that first address of the subnet is a valid addresses to configure in hosts/routers in case of IPv4 and IPv6 point to point networks? For example, in case of 192.0.2.0/31 one of the hosts would get 192.0.2.0/31 and the other would get…
Martin
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7
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2 answers

Cisco Catalyst cluster heartbeat switch issue - increasing input errors

PROBLEM: The servers in two clusters keep losing heartbeat connectivity with each other thus causing database outages. Outages are brief but disruptive. SETUP: There are two clusters of three servers each. Each server has one NIC connected to a…
VMEricAnderson
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7
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1 answer

Cisco BGP Graceful Restart behavior

In our environment we generally have ASR-1000X-2s everywhere peering via iBGP/eBGP. These routers have no redundant RPs, hence cannot keep forwarding traffic while the router reboots or crashes. As such, this is a clear example of a router that's…
Con7e
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1 answer

How to set IPv6 RA values for RDNSS and DNSSL on HPE/Aruba 5400R

I am detail-planning the roll out of IPv6 in our company. Right now I am stuck with IPv6 RA on our HPE/Aruba Access Switches. I cannot find any documentation how to set the Recursive DNS Server (RDNSS) and DNS Search List (DNSSL) values in the RA. I…
Andreas Rogge
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7
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1 answer

DCF and PCF in Wifi-networks

I am studying, trying to learn how DCF (Distributed Coordination Function) and PCF (Point Coordination Function) works as access methods in WiFi, and how they relate to infrastructure vs ad hoc networks. My teacher in this course has claimed that…
martinr
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7
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3 answers

Posible to connect VLAN switch through dumb switch?

Is it possible to connect a VLAN switch into a dumb switch ? The router will know how to reach network connected by a VLAN through the dumb switch please ? No edge effect ? By example, a schema of the project : Thanks !
Puma
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7
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3 answers

OSPF and its use of Multicast

When it comes to OSPF and its use of multicast, am I correct in believing that IGMP forwarding and an IGMP querier is still required within the local segment? My understanding would be without this, the frames would be treated as a broadcast and…
RickD
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7
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How the packet is routed between two host from same sub-net and associated with same AP?

Given host 'A' and 'B' have IP 10.10.0.5 and 10.10.0.8 respectively, the sub-net mask for both are 255.255.255.0, both 'A' and 'B' are associated and connected to the same AP, and the AP is connected to a switch at the interface 'X'. 'A' sends some…
H.Jamil
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