5 votes

If all subnets are a part of same vlan, then the network segregation using subnets does not make sense

So, does Vlan and Subnetting go hand in hand? What I meant is, if we need to use subnetting, the do we need to also make sure each subnet is part of a different vlan? In 98% of the cases, YES. You ...
Ron Trunk's user avatar
  • 67.5k
3 votes

Communication with different subnet masks

You’re trying to solve this problem at the wrong layer. If you want to filter nodes in a single subnet from talking to each other, but allow common access to servers, look at something like Private ...
Benjamin Dale's user avatar
3 votes
Accepted

Is internal network traffic sent to private subnets via their NAT Server?

Is internal network traffic sent to private subnets via their NAT Server? Internal traffic should never be NATted. NAT is a necessary translation between incompatible addressing schemes like sending ...
Zac67's user avatar
  • 84.4k
3 votes

Communicating to a device with a random IP, Subnet Mask and Gateway

The DUT (device-under-test) should ALWAYS be in it's own network. You have no idea what sort of things could be on the device sent back to you. It will be difficult to talk to a device when you know ...
Ricky's user avatar
  • 32.2k
2 votes

Access multiple networks via one managed switch

That what VLANs are for. VLANs partition a physical switch (or a switching structure) into multiple, virtual switches. Devices on different VLANs cannot communicate with each other on the data link ...
Zac67's user avatar
  • 84.4k
2 votes

Network classes vs subnetting/supernetting

Network address classes are dead (please let them rest in peace), killed in 1993 (two years before the commercial Internet in 1995) by RFCs 1517, 1518, and 1519, which defined CIDR (Classless Inter-...
Ron Maupin's user avatar
  • 99.6k
2 votes

VLSM Error on Cisco Distribution Switch

The subnet that 10.1.1.25/28 belongs to is 10.1.1.16/28, which overlaps with VLAN 20. It doesn't magically start at .24 just because you want it to.
Ron Trunk's user avatar
  • 67.5k
2 votes
Accepted

Outgrowing a /24 network

You can use any subnet from the RFC 1918 ranges - 192.168.0.0/16, 172.16.0.0/12, 10.0.0.0/8 - with any subnetting, including 192.168.2.0/23, 10.111.220.0/22, and 172.16.24.0/21. I'd recommend using at ...
Zac67's user avatar
  • 84.4k
2 votes
Accepted

If all subnets are a part of same vlan, then the network segregation using subnets does not make sense

if all the subnets are part of the same Vlan, does the above advantage still make sense? Not really. If there's no L2 segregation by VLANs (or separate switches) then any host can join any subnet ...
Zac67's user avatar
  • 84.4k
1 vote

What exactly does the term "main network" mean in subnetting?

Based on your description, you probably mean the network address. That is the address where all the host bits are set to 0. It is used to refer to all the possible addresses as a whole. You may find ...
Ron Trunk's user avatar
  • 67.5k
1 vote

Connecting and combining 2 networks

Do I just need to adjust the subnet mask so they can see devices in each building or do I need to re-ip one side to match the other? Either works. Your options: change the subnet mask to /21 (255....
Zac67's user avatar
  • 84.4k
1 vote
Accepted

Why is there overlap with two interfaces?

You can't have two router interfaces in the same subnet. 192.168.26.1/24 (255.255.255.0) and 192.168.26.33/24 are part of the same subnet. According to your diagram, you want to use a /27 mask, or ...
Ron Trunk's user avatar
  • 67.5k
1 vote

Public wifi router conflicts with company VPN IP address

That's the unfortunate, and unavoidable, problem of using other people's networks. The former (10/8) issue should be addressed by your VPN client software -- install a /32 route to the router, and VPN ...
Ricky's user avatar
  • 32.2k
1 vote

what information needs a router to make a decision?

A router uses its routing table to make routing decisions. A packet's destination IP address is matched against the table and the next hop from the entry with the longest prefix match is used. The ...
Zac67's user avatar
  • 84.4k
1 vote

IPv4 Address space for PTP links

Anything visible to/from the internet (i.e. not behind NAT) MUST have a routable internet address. If either of your Core or Edge routers generate and forward an ICMP error using a non-routeable ...
Ricky's user avatar
  • 32.2k
1 vote

IPv4 Address space for PTP links

CG-NAT uses the reserved address space 100.64.0.0/10 (RFC 6598) or 192.0.0.0/24 instances with DS-Lite (RFC 6890). You don't use those between your internal routers- not sure if I understand you ...
Zac67's user avatar
  • 84.4k
1 vote
Accepted

Switch ping to router with trunk port

Your diagram is a bit unclear, but let's try. tagged VLAN 2 SVI=192.168.2.1 =trunk= Secondary IP=192.168.2.254 A secondary address on the router's native interface doesn't work. The router needs to ...
Zac67's user avatar
  • 84.4k
1 vote

Communicating to a device with a random IP, Subnet Mask and Gateway

You should connect that device to an extra network segment/VLAN and move the necessary configuration from your workstation to the router connecting that VLAN. However, there's no magical way to make ...
Zac67's user avatar
  • 84.4k
1 vote

What happens to the unused IP addresses in the subnet that falls in between two routers?

To the question about what happens to the unused addresses in your subnets, nothing. They stay unused, not doing anything. That is, until you have an attacked in your network, being free to use any of ...
Fnyn's user avatar
  • 11
1 vote

RIP v2 Network Command

Unless you include the no auto-summary command in the RIPv2 router process, RIPv2 will assume classful networks the way RIPv1 does. I have not seen either of those labs, but it seems that the Neil ...
Ron Maupin's user avatar
  • 99.6k
1 vote

If all subnets are a part of same vlan, then the network segregation using subnets does not make sense

Agreed with what was stated above, using different subnet ranges in the same VLAN is unconventional - typically you'll want a subnet per VLAN. If you think about it VLAN is a 'virtual LAN' - at the ...
prusieck's user avatar

Only top scored, non community-wiki answers of a minimum length are eligible