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For questions about IP link local in a computer network, where it is a network address that is valid only for communications within the network segment (link) or the broadcast domain that the host is connected to.

3
votes
2answers
68 views

How to find the switch IP address based on MAC address?

On PC, the extra network adapter is configured as static 192.168.2.1. A switch with DHCP enabled is connected to 192.168.2.1 and if I login using the console (RS232) I see that it has 169.254.x.x ...
0
votes
2answers
28 views

Why does zxc.io goes to 127.0.0.5? [closed]

So i was searching for an .io domain but suddenly i tried going to zxc.io and suddenly my local server shows. A trace route shows this Tracing route to zxc.io [127.0.0.5] over a maximum of 30 hops: ...
6
votes
1answer
298 views

Why is an IPv6 Link-Local Address a /10?

I'm currently studying for my CompTIA Network+ Exam and am a bit confused as to why the IPv6 link-local address is a /10 and not a /12 or /16. Since each character in an IPv6 address is 4-bits and ...
1
vote
2answers
136 views

IPv6 link local address unicity on a routed network

Going through an exercise from the CCNA practice exam I encountered an example that required the configuration of link local addresses on all interfaces. On Router 1 all interfaces were set to FE80::...
0
votes
1answer
34 views

Detecting or announcing link changes in a switched network

Is there a protocol for that switches, or devices with multiple network ports, could use to signal link changes, or some mean to try to detect link changes? The scenario I'm trying to solve is ...
1
vote
2answers
127 views

IPv6 link-local only core network

When planning an IPv6 strategy is it possible to have link-local only addresses within the core transit network (sort of analogous to a BGP-free MPLS core)? If not why not? If yes are there any ...
5
votes
2answers
3k views

IPv6 ULA vs Link-Local

Could some one kindly explain what is the difference between IPv6 Unique Local Addressing and Link-Local addressing? I understand that Link-Local is for within a network, but isn't Unique Local ...
2
votes
1answer
508 views

Is it possible to build a fully functional LAN without any router, only with a switch?

I have used Link Local protocol several times but only to link two computers or a computer and another device to transfer files via FTP. But does Link Local protocol work for multiple hosts. Let's ...
3
votes
3answers
3k views

IPv6 NAT with Link-Local Address

It's more than usual to find NAT translating IPv4 private addresses (such as 192.168.0.0/16 or 10.0.0.0/8) to non private addresses. Is it possible that NAT translates even IPv6 link-local addresses (...
2
votes
2answers
417 views

Using 169.254.0.0/16 addresses on transit links?

I'm thinking of using 169.254.0.0/16 (link-local) addresses on OSPF transit links for increased security together with prefix-supression. This way the links are not reachable from any other non ...
1
vote
0answers
158 views

Why does NMAp find disconnected devices?

I want to wake up and see the devices connected on my local network, using NMAP. So I execute this command : sudo nmap -sn -PU[7] -PE 10.11.204.1/24 (extract from the man page : sn: Ping Scan - ...
4
votes
0answers
357 views

IPv6 link-local addresses for virtual interfaces are identical - how to assign “link-unique”? [closed]

I have a VPN connecting two virtual interfaces of two hosts. Both VPN interfaces have MAC addresses 00:00:00:00:00:00, as the OS (Linux) assigns link-local IPv6 address based on MAC address. So the ...
0
votes
3answers
1k views

How to detect the presence of a known MAC address on the .local ? (and get IP)

I would like to make a presence detection application which would be able to detect when a known device connects to the local Wifi network. So basically I would know the MAC address of the device, but ...
0
votes
2answers
799 views

What's the difference between a local-link address and a local-link route?

AFAIK Local link addresses are addresses that can only talk to devices within its own subnet. Routers will not forward packets that come from local link addresses. Local link addresses are defined in ...
0
votes
1answer
600 views

How is it possible that tracert finds a route to link-local over outside internet?

From what I know, routers do not forward packets from/to address of the range 169.254.x.x That being said, after exchanging a router "tracert 169.254.0.1" did in fact find a route with 13 hops. I'm ...