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1500 questions
8
votes
3 answers

How to connect 3rd party SFP to the cisco switch?

I am trying to connect "sfp-1ge-fe-e-t" sfp module to CISCO Catalyst C3560G-48TS switch. When i pluged module to the port and following error was shown: %GBIC_SECURITY_CRYPT-4-VN_DATA_CRC_ERROR: GBIC in port Gi0/49 has bad crc Then I searched…
Simral Abdurahim
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8
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3 answers

routing between vlans not working

I need to put a Cisco router behind an ISP router. (The ISP doesn't allow us to use their modem only.) I've called the ISP technical service and they've set up the connection with me. Their router will be used as a gateway for the Cisco router. I…
RobbeM
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8
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2 answers

VLAN load sharing on Metro-E links between two Juniper EX 4200

We have Juniper EX 4200 as core switch at two sites connected Cisco 2960s and Cisco 3560s (access layer switches). For even-numbered VLANs, one Juniper switch is root bridge and for odd-numbered VLANs, other Juniper switch is the root bridge. We…
starcity
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8
votes
2 answers

intersymbol interference (ISI), channels, and frequencies

When describing 802.11b/g and the 2.4 GHz channels, or 802.11a/n with 5 GHz channels, textbooks (CWNA Official Study Guide) often show some figure with channels spaced such that certain channels cannot overlap and therefore ISI is avoided. The…
T. Webster
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8
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2 answers

Is it true that the fd00::/8 address range (ULA) in ipv6 is for machines that you NEVER want to speak with anything on the Internet?

Is it true that the fd00::/8 address space (User Local Addresses) in ipv6 is for machines that you NEVER want to speak with anything on the Internet? I was just reading that here and rather surprised to find that was the case.
leeand00
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8
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7 answers

How LAN works in video games if only one station is permitted to transmit?

I've read the in a LAN the data is transmitted in packets so as to allow only one station to transmit at a given time, so how could this be applied in video games LAN parties if only one device is going to transmit at a given time ? Data are…
eis3nheim
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8
votes
1 answer

How does UDP NAT Know When To Remove The Rule

So say you are a user behind a NAT/router on an internal network. You begin sending UDP data to an internet-facing server. The packet hits your router, it inserts an entry to allow returning packets from that server on a specific port to be…
James Dean
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8
votes
2 answers

NAT and UDP problems

I have a question regarding NAT, UDP and TCP. Given a standard NAT server, is it a problem for it that UDP is connectionless? If so, why? And does TCP or QUIC solve this problem?
chimi
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8
votes
2 answers

Single Public IP Address for multiple physical locations

Is it possible to get or set up a public IP address that is load-balanced between multiple physical locations or sites? It may be something like a virtual IP address (VIP), which points to multiple IP addresses, and incoming traffic is load-balanced…
kzia
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8
votes
1 answer

Struggling inbound and outbound traffic engineering to/from iBGP peers at different POPs

We are a managed service provider running a small sized network in a single datacentre in Sydney. We've recently deployed a new POP inter-state in Melbourne (both are on the east coast of Australia), and for the first time I am having to face…
Geekman
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8
votes
1 answer

Distributed Trunking Inconsistent MAC table

I've recently faced a problem in an HPE Distributed-Trunking Switch-to-Switch Square-Topology. Image 1 (shows the essential part of the architecture that consists of 4 switches working in pairs, being switch A1 and A2 the first pair, B1 and B2 the…
Francesco Ruggeri
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8
votes
3 answers

Why are iBGP routes not propagated to other iBGP neighbors?

I have been searching this on the web. It is generally expressed as by default, iBGP does not propagate routes learned via other iBGP neighbors. I am trying to understand the underlying reason. The answers I have found are somewhat circular: the…
john
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8
votes
1 answer

How to force VPLS/L2VPN to use a specific path

We're using VPLS and L2VPN on Juniper MX for L2 connections. Signaling is done via BGP and label distribution via LDP. Now we want one L2VPN to use a specific path trough the network and not follow the IGP. As we currently only use LDP we would…
Sebastian Wiesinger
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8
votes
3 answers

How is anycast implemented?

According to this answer Google DNS (8.8.8.8) has low worldwide latencies because it uses anycast. How is anycast actually implemented? That is, how does a packet get routed to different computers around the world? Wouldn't that mean that different…
Darthtrader
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8
votes
5 answers

Is rerouting possible in UDP?

So I am trying to understand routing for TCP and UDP segments. I have a couple of things that I am confused about: In TCP, is there any specification on how many packets would be dropped before a rerouting would be done for a connection established…
Ibrahim Nadir
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