Alex Levit
  • Member for 4 years, 11 months
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Do typical Ethernet switches have timeout for MAC table entries?
Accepted answer
4 votes

A typical timeout is 5 min (often called mac-aging). Re-learning MAC addresses can be dangerous in terms of security. On the other hand, when you disconnect your computer from the switch, all MACs ...

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Which is the correct configuration for this network scenario?
3 votes

I would assume your customer wants the separation due to security reasons. In this case VLAN will not do the desired separation. What you probably need is Firewall that will control what is allowed to ...

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Why do we need "port forwarding"?
3 votes

As a programmer you really don't need. This is network function usually used to connect to server sitting after NAT via public network. Sometimes can also be used to convert TCP/UDP port X to port Y ...

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Multicast ARP Switch
3 votes

Multicast does not use ARP. Multicast IP Address mapped statically into Multicast MAC. Check here: https://networklessons.com/multicast/multicast-ip-address-to-mac-address-mapping/ Source MAC address ...

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Is "port-forwarding" used just for comfort?
2 votes

The short answer is "NO". There is nothing common between "writing software" and port forwarding. Check here Why do we need "port forwarding"? to learn more why port forwarding is needed

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Differentiate Data or Cable/DSL visitor on a Website
2 votes

Is carrier is also ISP in your country? You can know ISP by the IP, but carrier can be different (technically). Another question is each carrier uses only one access method ? if the answers yes&...

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Why RJ45 8-Pin (Cross Connection) is used instead of Straight Connection between 2 computers or Network
1 votes

There are both cross and straight connections. In the past it was important to use specifically one or another - depending if you connect two devices directly or via hub/switch. Today most NICs and ...

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Is it possible to control data length inside tcp frame?
1 votes

Sure, you can affect MSS (maximum segment size) in a device. In Linux it can be done either globally by sysctl https://itsthe.network/post/TCP%20MSS%20Linux%20Kernel%20Setting/) or per rule (e.g. ...

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Related to layer 3 switch
1 votes

What you describe can be achieved by a Router with Access List. Each LAN may have it's seprate vlan (as well L3 subnet). Then put Access Rules allowing flow from server to each access LAN and denying ...

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IPSec : Is it normal to see packet drops during SA re-keying?
1 votes

I have seen it happening in Linux ipsec-tools (KAME stack/racoon IKE daemon), the loss is about 1-2 seconds during re-key.

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OSI Model and Networking Protocols Relationship
1 votes

HTTP (not HTML) has both presentation and application layer. VPN Tunnels add overlay layers to the existing stack: it could be either Layer 2 or Layer 3 depends of their kind. Then you will be able to ...

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How fast data travel wirelessly than in metal?
0 votes

Wireless communication (especially cellular) is slower due to errors probability which is much higher than wired. It really depends on many parameters such as signal strength of the base station. In ...

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Source MAC address across VPN
0 votes

You need to use Layer 2 VPN for this to work. Then you can get virtually same LAN across VPN endpoints.

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What's the difference between LSA and LSR, LSU, LSAck in OSPF
0 votes

LSA can be seen as "item of information": Link State Advertisement. LSU,LSR, LSack are messages managing the sync between routers of this items. LSU: link state update LSR: link state request LSack:...

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802.1Q VLAN Tagging over WiFi (Meraki)
0 votes

In general 550 is great number for single network; splitting will make it more healthy. Separating your network into VLANs will reduce number of broadcasts clients receive, but not necessarily will ...

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