1/2/2023 0 Comments Ipv6 loopback![]() ![]() I can ping the link local ips from each respective router to the other but I cannot ping the loopback interface IPs from the either router to the other. Sh ipv6 int brief outputs: FE80::21D:71FF:FE53:6C00 for Vlan10 interface IP Sh ipv6 int brief outputs: FE80::219:7FF:FEFE:FC00 for Vlan10 interface IP Ipv6 route yyyy:yyyy:100::10:0:2/128 Vlan10 FE80::21D:71FF:FE53:6C00 Answer (1 of 3): Written in hexadecimal 0000:0000:0000:0000:0000:0000:0000:0001 Which can be simplified 0:0:0:0:0:0:0:1 And due to a further rule allowing us to abbreviate the first single continuous group of zeroes can be further simplified to:- ::1 This has the same function as the 127.0. The IPv6 functionality can be configured by modifying the following registry key: Location: HKEYLOCALMACHINE\SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters\. InterNetworkV6) loopBack is an IPv6 loopback address whose internal format. Before you modify it, back up the registry for restoration in case problems occur. ![]() Is this not supported? Am I doing something wrong? Indicates whether the specified IP address is the loopback address. I was hoping that I would be able to use the link local IPv6 addresses of the port channel between the routers to route the loopback address information, however, this does not seem to be working in Cisco IOS. The issue I am having now is attempting to get the loopback addresses to route between routers. ![]() In the end I essentially decided to use /128 on loopback interfaces using globally unique IPv6 space out of a /64 reserved for loopback numbering across our entire network. To complete my question based on the current answer: $ tail -3 /etc/resolv.I have been doing some reading on IPv6 and have read a few different best practices guides and all of them seem to have conflicting information on the best way to assign loopback addresses. I am curious as to why during those 2 hours of my computer uptime, there are 4 packets on IPv6 loopback only? Thank you. Num pkts bytes target prot opt in out source destinationġ 0 0 DROP all - any any anywhere anywhere ctstate INVALID /* protection */Ģ 29177 3028K ACCEPT all - lo any anywhere anywhere /* loopback */ģ 0 0 ACCEPT icmp - any any anywhere anywhere limit: avg 5/sec burst 15 /* icmp4 */Ĥ 29053 93M ACCEPT all - any any anywhere anywhere ctstate RELATED,ESTABLISHED /* traffic4 */ĥ 0 0 ACCEPT tcp - any any 192.168.0.0/24 anywhere ctstate NEW,ESTABLISHED tcp dpt:ssh /* ssh_local */Ĭhain INPUT (policy DROP 21 packets, 3321 bytes)ġ 1 60 ACCEPT all any any anywhere anywhere ctstate INVALID /* protection */Ģ 4 292 ACCEPT all lo any anywhere anywhere /* loopback */Ĩ ACCEPT ipv6-icmp any any anywhere anywhere limit: avg 20/sec burst 50 /* icmp6 */Ĥ 279K 421M ACCEPT all any any anywhere anywhere ctstate RELATED,ESTABLISHED /* traffic6 */ĥ 18 3172 ACCEPT udp any any anywhere fe80::/64 ctstate NEW udp dpt:dhcpv6-client /* dhcp6 */ My OS: Linux Mint 20, kernel version 5.4.0-42.įor the purpose of generating the output below, I defined an alias: alias iptables-watch="sudo watch -n30 'iptables -list INPUT -verbose -line-numbers
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