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For questions about Networking that includes design, and use of a network, the physical cabling, hub, bridge, switch, router, and so forth. Anything in relation to networking and its technologies.

3
votes
This happens when Cacti is unable to receive a response from the device being polled. This could be due to the device not responding (high CPU, bug in SNMP code etc), data being lost between device a …
answered Nov 16 '17 by Karl Billington
1
vote
A hub is the cheaper option, but you will be limited to 100 Mbps and as you will be operating in half duplex mode, you will only get a fraction of that bandwidth and it is shared, both upstream and do …
answered Jul 18 '18 by Karl Billington
2
votes
The default behaviour for F5 Virtual Servers is not to NAT the client source address. You can configure SNAT Automap on the Virtual Server and this will translate the client address to the outgoing i …
answered Nov 8 '17 by Karl Billington
15
votes
Because 224.0.0.0/24 is the range assigned by IANA for local multicast - Local Network Control Block. Addresses in this range are non-routable, they can only exist on a link, and cannot be … -addresses-1 The purpose of the Local Network Control Block is defined in RFC 5771: Local Network Control Block (224.0.0/24) Addresses in the Local Network Control Block are used for protocol …
answered Jul 21 '18 by Karl Billington
4
votes
It looks like this is Wireshark reassembling a HTTP PDU that was split between multiple TCP segments. The PDU was split between segments 78, 79 and 80. Wireshark reassembled the PDU as frame 80. I …
answered Apr 7 '18 by Karl Billington
1
vote
You need to make sure the two hosts are in different IP networks. If the hosts are in the same network then they will attempt to ARP directly for the other host and not use the gateway. In this case … as they are not in the same LAN, pings will fail. Most routers won’t let you configure the same network on two different interfaces, but I know that some do. If this is the case, they expect the …
answered Jul 5 '18 by Karl Billington
1
vote
A VLAN is a layer 2 concept, it doesn't have any knowledge of layer 3. Each VLAN consists of a number of ports assigned to that VLAN and a MAC address table, for that VLAN only. It is definitely pos …
answered Jul 7 '18 by Karl Billington
3
votes
As they are on the same network, they do not need to send traffic through a router. They send out ARP requests to get the MAC address of the other device, then send Ethernet frames directly between … each other. If a host needs to send something to another network, it sends it to the router (default gateway). The DHCP server is only used once to assign an IP address to the PC when it boots up …
answered Jul 9 '18 by Karl Billington
4
votes
forwarded ahead of other traffic, so important not to put too much traffic in the priority queue. Low latency queuing only really works if you have other types of traffic on the network to push the priority traffic ahead of. …
answered Jul 18 '18 by Karl Billington
4
votes
in the network. Similar can happen with MST if it is sharing an instance with other VLANs. You also risk interacting with the SP's STP (if they haven't disabled). If you use L2, I would recommend …
answered Jul 17 '18 by Karl Billington