Regenerating Link Local IPv6 Addresses in Mikrotik

IPv6 link local address generate automatically if IPv6 package is enabled.  For enabling IPv6 you may follow this post

[admin@Mikrotik] > /ipv6 address print 
Flags: X - disabled, I - invalid, D - dynamic, G - global, L - link-local 
# ADDRESS FROM-POOL INTERFACE 
0 DL fe80::e97:42ff:fef5:7a00/64 ether1 
1 DL fe80::e97:42ff:fef5:7a03/64 ether4 
2 DL fe80::e97:42ff:fef5:7a01/64 ether2 
3 DL fe80::e97:42ff:fef5:7a02/64 ether3 
4 DL fe80::dcac:40ff:feed:b345/64 loopback-1

Unlike IPv4, IPv6 link local address are crucial for routing. So if the address is removed mistakenly it will make routing problem.

[admin@Mikrotik] > /ipv6 address print 
Flags: X - disabled, I - invalid, D - dynamic, G - global, L - link-local 
# ADDRESS FROM-POOL INTERFACE 
0 DL fe80::e97:42ff:fef5:7a03/64 ether4 
1 DL fe80::e97:42ff:fef5:7a01/64 ether2 
2 DL fe80::e97:42ff:fef5:7a02/64 ether3 
3 DL fe80::dcac:40ff:feed:b345/64 loopback-1 
4 G 2000:5a40:0:11::2/126 ether1

As you can see, though static IPv6 is configured on the interface , still the address is showing unreachable

How to regenerate link local IPv6 address on Mikrotik when deleted ?

The solution is quiet simple, simply  reset (disable and re-enable) the interface. This applicable for all type of interface Ethernet/VLAN/bridge. For minimum impact on live traffic you may try following method

/interface ethernet disable 0; enable 0

Result,

[admin@Mikrotik] /interface ethernet> /ipv6 address print 
Flags: X - disabled, I - invalid, D - dynamic, G - global, L - link-local 
# ADDRESS FROM-POOL INTERFACE ADVERT
0 DL fe80::e97:42ff:fef5:7a03/64 ether4 no 
1 DL fe80::e97:42ff:fef5:7a01/64 ether2 no 
2 DL fe80::e97:42ff:fef5:7a02/64 ether3 no 
3 DL fe80::dcac:40ff:feed:b345/64 lo-1 no 
4 G 2000:5a40:0:11::2/126 ether1 no 
5 DL fe80::e97:42ff:fef5:7a00/64 ether1 no 

 

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