DevOps та адміністрування Windows, Linux

This article describes how to setup GRE PTP tunnel on RHEL and Ubuntu linux distributives.

General

GRE visualization:

GRE tunnels are IP-over-IP tunnels which can encapsulate IPv4/IPv6 and unicast/multicast traffic. To create a GRE tunnel on Linux, you need ip_gre kernel module, which is GRE over IPv4 tunneling driverю

For GRE configuration 2 pairs of addresses are needed - external address of each peer and internal address used inside tunnel on each peer.

First check kernel modules:

lsmod | grep gre
modprobe ip_gre
modinfo ip_gre

Interface configuration on RHEL:

DEVICE=tun0

BOOTPROTO=none

ONBOOT=no

TYPE=GRE

# External address of local peer

MY_OUTER_IPADDR=95.167.35.26

# Internal local peer address inside the tunnel

MY_INNER_IPADDR=172.17.254.1

# external address of remote peer

PEER_OUTER_IPADDR=178.45.248.69

# internal peer address of remote peer inside the tunnel

PEER_INNER_IPADDR=172.17.254.2

###On the remote node interface should be configured similarly (addresses of local and remote peer should be mirrored).

Interface configuration on Ubuntu:

auto tun0
iface tun0 inet static
    address 172.17.254.1
    netmask 255.255.255.0
    broadcast 172.17.254.255
    up ifconfig tun0 multicast
    pre-up iptunnel add tun0 mode gre local 95.167.35.26 remote 178.45.248.69 dev ens3 ttl 255
    pointopoint 172.17.254.2
    post-down iptunnel del tun0

###On the remote node interface should be configured similarly (addresses of local and remote peer should be mirrored).

DevOps та адміністрування Windows, Linux

GRE point-to-point tunnel (RHEL, Ubuntu)

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