3.7 KiB
3.7 KiB
A Multi-Path Bidirectional Layer 3 Proxy
Setup Notes
Linux
Policy Based Routing
ip route flush table 10
ip route add table 10 to 1.1.1.0/24 dev eth1
ip rule add from 1.1.1.4 table 10 priority 10
ip route flush table 11
ip route add table 11 to 1.1.1.0/24 dev eth2
ip rule add from 1.1.1.5 table 11 priority 11
ARP Flux
sysctl -w net.ipv4.conf.all.arp_announce=1
sysctl -w net.ipv4.conf.all.arp_ignore=1
See http://kb.linuxvirtualserver.org/wiki/Using_arp_announce/arp_ignore_to_disable_ARP
Setup Scripts
These are functional setup scripts that make the application run as intended on Linux.
Remote Portal
Pre-Start
#!/bin/bash
set -e
## Set up variables
REMOTE_PORTAL_ADDRESS=A.B.C.D
## IPv4 Forwarding
sysctl -w net.ipv4.ip_forward=1
sysctl -w net.ipv4.conf.eth0.proxy_arp=1
## Transfer the local routing table to a much lower priority
(ip rule show | grep '20:') > /dev/null || ip rule add from all table local priority 20
ip rule del priority 0 2> /dev/null || true
## Ports to route locally
### MPBL3P
ip rule del priority 1 2> /dev/null || true
ip rule add to "$REMOTE_PORTAL_ADDRESS" dport 1234 table local priority 1
### SSH
ip rule del priority 2 2> /dev/null || true
ip rule add to "$REMOTE_PORTAL_ADDRESS" dport 22 table local priority 2
Post-Start
#!/bin/bash
set -e
## Set up variables
REMOTE_PORTAL_ADDRESS=A.B.C.D
## Tunnel addr/up
ip addr add 172.19.152.2/31 dev nc0
ip link set up nc0
# Route packets to the interface but not for nc via the tunnel
ip route flush table 19
ip route add table 19 to "$REMOTE_PORTAL_ADDRESS" via 172.19.152.3 dev nc0
ip rule del priority 19 2> /dev/null || true
ip rule add to "$REMOTE_PORTAL_ADDRESS" table 19 priority 19
Local Portal
Pre-Start
#!/bin/bash
set -e
## Set up variables
GATEWAY_INTERFACE=eth0
GATEWAY_ADDRESS=10.36.12.1
## Fix ARP
sysctl -w net.ipv4.conf.all.arp_announce=1
sysctl -w net.ipv4.conf.all.arp_ignore=1
## IPv4 Forwarding
sysctl -w net.ipv4.ip_forward=1
## Gateway Interface Setup
ip addr flush dev "$GATEWAY_INTERFACE"
ip addr add "$GATEWAY_ADDRESS"/32 dev "$GATEWAY_INTERFACE"
ip link set up "$GATEWAY_INTERFACE"
## Per-Interface Routing Tables
### 10.10.0.0/24
ip route flush table 10
ip route add table 10 default via 10.10.0.1
ip rule del priority 10 2> /dev/null || true
ip rule add from 10.10.0.0/24 table 10 priority 10
### 192.168.0.0/24
ip route flush table 11
ip route add table 11 default via 192.168.0.1
ip rule del priority 11 2> /dev/null || true
ip rule add from 192.168.0.0/24 table 11 priority 11
Post-Start
#!/bin/bash
set -e
## Set up variables
REMOTE_PORTAL_ADDRESS=A.B.C.D
GATEWAY_INTERFACE=eth0
## Tunnel Address and Enable
ip addr add 172.19.152.3/31 dev nc0
ip link set up nc0
## Route Outbound Packets Correctly
ip route flush table 20
ip route add table 20 default via 172.19.152.2 dev nc0
ip rule del priority 20 2> /dev/null || true
ip rule add from "$REMOTE_PORTAL_ADDRESS" iif "$GATEWAY_INTERFACE" table 20 priority 20
## Route Inbound Packets Correctly
ip route flush table 21
ip route add table 21 to "$REMOTE_PORTAL_ADDRESS" dev "$GATEWAY_INTERFACE"
ip rule del priority 21 2> /dev/null || true
ip rule add to "$REMOTE_PORTAL_ADDRESS" table 21 priority 21
Client
Connect to GATEWAY_INTERFACE and set the IP to REMOTE_PORTAL_ADDRESS/32 with a gateway of GATEWAY_ADDRESS.