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1.9 KiB
1.9 KiB
GRE + IPsec on Debian based distros
- Install racoon from ipsec-tools.
- Define an IPsec security policy in /etc/ipsec-tools.conf
- Load the IPsec security policy into the IPsec security policy database.
- Configure the racoon daemon.
- Configure a GRE tunnel.
Used resources in this example:
- tunnel endpoints: 1.2.3.4 and 5.6.7.8
- internal IPv4 addresses: 10.0.0.1 and 10.0.0.2
Define an IPsec security policy
Example policy on 1.2.3.4:
#!/usr/sbin/setkey -f
spdadd 1.2.3.4 5.6.7.8 gre -P out ipsec esp/transport//require;
spdadd 5.6.7.8 1.2.3.4 gre -P in ipsec esp/transport//require;
Change the direction on 5.6.7.8.
Load the IPsec security policy into the IPsec security policy database
Load the policy with the setkey command.
setkey -f /etc/ipsec-tools.conf
Afterward check the policy database with:
setkey -DP
Configure the racoon daemon
path pre_shared_key "/etc/racoon/psk.txt";
path certificate "/etc/racoon/certs";
log info;
listen {
# replace with local tunnel endpoint
isakmp 1.2.3.4 [500];
isakmp_natt 1.2.3.4 [4500];
}
# replace with remote tunnel endpoint
remote 5.6.7.8 [500] {
exchange_mode main;
proposal_check strict;
my_identifier asn1dn;
peers_identifier asn1dn;
lifetime time 1 hour;
certificate_type x509 "local.crt" "local.key";
peers_certfile x509 "remote.crt";
ca_type x509 "ca.crt";
verify_cert on;
send_cert off;
send_cr off;
proposal {
encryption_algorithm aes 256;
hash_algorithm sha256;
authentication_method rsasig;
dh_group modp4096;
}
}
# local tunnel endpoint, remote tunnel endpoint, GRE ip protocol number
sainfo (address 1.2.3.4 address 5.6.7.8 47) {
pfs_group modp4096;
lifetime time 1 hour;
encryption_algorithm aes 256;
authentication_algorithm hmac_sha1;
compression_algorithm deflate;
}