Revert "Add incremental RST-to-MyST swap mechanism (#1857)" (#1892)

This reverts commit 4b36114e053ee11d0cb264a1e4cfe4692d78f194.

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----
-lastproofread: '2021-06-29'
----
-
-(examples-pppoe-ipv6-basic)=
-
-# PPPoE IPv6 Basic Setup for Home Network
-
-This document is to describe a basic setup using PPPoE with DHCPv6-PD +
-SLAAC to construct a typical home network. The user can follow the steps
-described here to quickly setup a working network and use this as a starting
-point to further configure or fine-tune other settings.
-
-To achieve this, your ISP is required to support DHCPv6-PD. If you're not sure,
-please contact your ISP for more information.
-
-## Network Topology
-
-```{image} /_static/images/pppoe-ipv6-pd-diagram.webp
-:align: center
-:alt: Network Topology Diagram
-:width: 60%
-```
-
-
-## Configurations
-
-### PPPoE Setup
-
-```none
-set interfaces pppoe pppoe0 authentication password <YOUR PASSWORD>
-set interfaces pppoe pppoe0 authentication username <YOUR USERNAME>
-set interfaces pppoe pppoe0 service-name <YOUR SERVICENAME>
-set interfaces pppoe pppoe0 source-interface 'eth0'
-```
-
-- Fill `password` and `user` with the credential provided by your ISP.
-- `service-name` can be an arbitrary string.
-
-### DHCPv6-PD Setup
-
-During address configuration, in addition to assigning an address to the WAN
-interface, ISP also provides a prefix to allow the router to configure addresses
-of LAN interface and other nodes connecting to LAN, which is called prefix
-delegation (PD).
-
-```none
-set interfaces pppoe pppoe0 ipv6 address autoconf
-set interfaces pppoe pppoe0 dhcpv6-options pd 0 interface eth1 address '100'
-```
-
-- Here we use the prefix to configure the address of eth1 (LAN) to form
-  `<prefix>::64`, where `64` is hexadecimal of address 100.
-
-<!-- list break -->
-
-- For home network users, most of time ISP only provides /64 prefix, hence
-  there is no need to set SLA ID and prefix length. See {ref}`pppoe-interface`
-  for more information.
-
-### Router Advertisement
-
-We need to enable router advertisement for LAN network so that PC can receive
-the prefix and use SLAAC to configure the address automatically.
-
-```none
-set service router-advert interface eth1 link-mtu '1492'
-set service router-advert interface eth1 name-server <NAME SERVER>
-set service router-advert interface eth1 prefix ::/64 valid-lifetime '172800'
-```
-
-- Set MTU in advertisement to 1492 because of PPPoE header overhead.
-- Set DNS server address in the advertisement so that clients can obtain it by
-  using RDNSS option. Most operating systems (Windows, Linux, Mac) should
-  already support it.
-- Here we set the prefix to `::/64` to indicate advertising any /64 prefix
-  the LAN interface is assigned.
-- Since some ISPs disconnects continuous connection for every 2~3 days, we set
-  `valid-lifetime` to 2 days to allow PC for phasing out old address.
-
-### Basic Firewall
-
-To have basic protection while keeping IPv6 network functional, we need to:
-- Allow all established and related traffic for router and LAN
-- Allow all icmpv6 packets for router and LAN
-- Allow DHCPv6 packets for router
-
-```none
-set firewall ipv6 name WAN_IN default-action 'drop'
-set firewall ipv6 name WAN_IN rule 10 action 'accept'
-set firewall ipv6 name WAN_IN rule 10 state established 'enable'
-set firewall ipv6 name WAN_IN rule 10 state related 'enable'
-set firewall ipv6 name WAN_IN rule 20 action 'accept'
-set firewall ipv6 name WAN_IN rule 20 protocol 'icmpv6'
-set firewall ipv6 name WAN_LOCAL default-action 'drop'
-set firewall ipv6 name WAN_LOCAL rule 10 action 'accept'
-set firewall ipv6 name WAN_LOCAL rule 10 state established 'enable'
-set firewall ipv6 name WAN_LOCAL rule 10 state related 'enable'
-set firewall ipv6 name WAN_LOCAL rule 20 action 'accept'
-set firewall ipv6 name WAN_LOCAL rule 20 protocol 'icmpv6'
-set firewall ipv6 name WAN_LOCAL rule 30 action 'accept'
-set firewall ipv6 name WAN_LOCAL rule 30 destination port '546'
-set firewall ipv6 name WAN_LOCAL rule 30 protocol 'udp'
-set firewall ipv6 name WAN_LOCAL rule 30 source port '547'
-set firewall ipv6 forward filter rule 10 action jump
-set firewall ipv6 forward filter rule 10 jump-target 'WAN_IN'
-set firewall ipv6 forward filter rule 10 inbound-interface name 'pppoe0'
-set firewall ipv6 input filter rule 10 action jump
-set firewall ipv6 input filter rule 10 jump-target 'WAN_LOCAL'
-set firewall ipv6 input filter rule 10 inbound-interface name 'pppoe0'
-```
-
-Note to allow the router to receive DHCPv6 response from ISP. We need to allow
-packets with source port 547 (server) and destination port 546 (client).