![]() ![]() For example, a /126 subnet has 126 bits of network address, leaving 2 bits for host/network address (bottom being the network anycast address, although this is not required there is no top address for a directed broadcast). Netmasks are written in the same 'mask length' format as CIDR ( Classless Inter-Domain Routing) IPv4, with '/length' after the address. For example, the above address will most commonly be written as 2a05:b400:d::1. These shorthands are the usual way in which IPv6 addresses are presented for display in software and network equipment. In addition, once per address (and no more) a contiguous run of one or more blocks which are all ':0000:' may be replaced by a double colon. When writing addresses, within each block of 4 hex digits the leading zeroes may be omitted. ![]() IPv6 uses 128 bit addresses, written in 8 groups of 16 bit blocks (each written as 4 hexadecimal digits), separated by colons - e.g. The most visible difference between IPv6 and IPv4 is the larger addresses: IPv4 addresses are 32 bits long and written in 'dotted quad' format with four decimal numbers - e.g. More details on this issue are given below. ![]() It is important to remember that IPv4 and IPv6 are technically completely separate protocols with no way to intercommunicate between them. More comprehensive information on IPv6 in general is available elsewhere and should be consulted by IT staff, prior to deployment. This section is intended as a basic introduction to IPv6 for the purpose of understanding the decisions taken when designing the deployment of a new protocol on the UDN. Registering host addresses in IP Register.Semantically opaque interface identifiers "secured" (RFC 7217) addresses.This document explains some of the key differences between the two protocols and how IPv6 will be implemented on the University Data Network (UDN). With an aim that IPv4 can gradually be deprecated, as this becomes feasible. Whilst there is no defined date for the ending of support IPv4 (and it is expected this will be many years in the future, probably decades), the general trend is toward IPv6 and, in the interim, support for both protocols should be included on any new service. The version used predominantly on the internet, which most people are familiar with, is version 4. University Information Services (UIS) is gradually enabling its services with support for the Internet Protocol version (IPv6), the next generation of TCP/IP, the network communications protocol which is used to route traffic across the global internet. UIS will make a formal announcement when the updates are complete. There will also be some information added to explain the migration from the old to the new UDN prefix. Nft -f /etc/nftables/nftables-redirect-clash-local.Please note that some of the information in this document is in flux and subject to final changes. Meta l4proto tcp ip saddr 172.16.0.0/12 tcp dport 7890 accept Meta l4proto tcp ip saddr 192.168.0.0/16 tcp dport 7890 accept Meta l4proto tcp ip saddr 127.0.0.0/8 tcp dport 7890 accept Meta l4proto tcp ip saddr 10.0.0.0/8 tcp dport 7890 accept Type filter hook input priority filter policy accept Meta l4proto udp udp dport 53 jump clashv6_dns Meta l4proto udp udp dport 53 jump clash_dns_out Type nat hook output priority -100 policy accept Meta l4proto tcp ip saddr 10.0.0.0/8 redirect to :7892 Meta l4proto udp udp dport 53 jump clash_dns Type nat hook prerouting priority dstnat policy accept Useradd shellclash -u 7890 groupmod shellclash -g 7890 sed -Ei s/7890:7890/0:7890/g /etc/passwdĮlse grep -qw shellclash /etc/passwd || echo "shellclash:x:0:7890:::" > /etc/passwdįi fi cat > /etc/nftables/nftables-redirect-clash-local.nft <<EOF Cat > /etc/nftables/nftables-redirect-clash.nft /dev/null | grep 'root' ) " ] then if ckcmd userdel useradd groupmod then userdel shellclash 2>/dev/null ![]()
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