[Contents] [Prev] [Next] [Index] [Report an Error]

Example: ES PIC IKE Dynamic SA Configuration

Figure 66: ES PIC IKE Dynamic SA Topology Diagram

Image g015518.gif

Figure 66 shows the same IPSec topology as seen in the ES PIC manual SA example. However, this time the configuration requires Routers 2 and 3 to establish an IPSec tunnel using an IKE dynamic SA, enhanced authentication, and stronger encryption. Routers 1 and 4 continue to provide basic connectivity and are used to verify that the IPSec tunnel is operational.

On Router 1, provide basic OSPF connectivity to Router 2.

Router 1

[edit]
interfaces {
so-0/0/0 {
description "To R2 so-0/0/0";
unit 0 {
family inet {
address 10.1.12.2/30;
}
}
}
lo0 {
unit 0 {
family inet {
address 10.0.0.1/32;
}
}
}
}
routing-options {
router-id 10.0.0.1;
}
protocols {
ospf {
area 0.0.0.0 {
interface so-0/0/0.0;
interface lo0.0;
}
}
}

On Router 2, enable OSPF as the underlying routing protocol to connect to Routers 1 and 3. Configure a bidirectional IKE dynamic SA called sa-dynamic at the [edit security ipsec security-association] hierarchy level. For your IKE policy and proposal, use preshared keys for the authentication method, SHA-1 for the authentication algorithm, 3DES-CBC for encryption, group 2 for the Diffie-Hellman group, main mode, 3600 seconds for the lifetime, and a preshared key of juniper for the initial IKE negotiation. For your IPSec policy and proposal, use ESP for the protocol, HMAC-SHA1-96 for authentication, 3DES-CBC for encryption, 28800 seconds for the lifetime, and group 2 for the PFS group.

To direct traffic into the ES PIC and the IPSec tunnel, create two firewall filters. The es-traffic filter matches inbound traffic from Router 1 destined for Router 4, whereas the es-return filter matches the return path from Router 4 to Router 1. Apply the es-traffic filter to the so-0/0/0 interface, and then apply both the es-return filter and the sa-dynamic SA to the es-0/3/0 interface.

Router 2

[edit]
interfaces {
so-0/0/0 {
description "To R1 so-0/0/0";
unit 0 {
family inet {
filter {
input es-traffic; # Apply a filter that sends traffic to the IPSec tunnel here.
}
address 10.1.12.1/30;
}
}
}
so-0/0/1 {
description "To R3 so-0/0/1";
unit 0 {
family inet {
address 10.1.15.1/30;
}
}
}
es-0/3/0 {
unit 0 {
tunnel { # Specify the IPSec tunnel endpoints here.
source 10.1.15.1;
destination 10.1.15.2;
}
family inet {
ipsec-sa sa-dynamic; # Apply the dynamic SA here.
filter {
input es-return; # Apply the filter that matches return IPSec traffic here.
}
}
}
}
lo0 {
unit 0 {
family inet {
address 10.0.0.2/32;
}
}
}
}
routing-options {
router-id 10.0.0.2;
}
protocols {
ospf {
area 0.0.0.0 {
interface so-0/0/0.0;
interface so-0/0/1.0;
interface lo0.0;
}
}
}
security {
ipsec {
proposal es-ipsec-proposal { # Define your IPSec proposal specifications here.
protocol esp;
authentication-algorithm hmac-sha1-96;
encryption-algorithm 3des-cbc;
lifetime-seconds 28800;
}
policy es-ipsec-policy { # Define your IPSec policy specifications here.
perfect-forward-secrecy {
keys group2;
}
proposals es-ipsec-proposal; # Reference the IPSec proposal here.
}
security-association sa-dynamic { # Define your dynamic SA here.
mode tunnel;
dynamic {
ipsec-policy es-ipsec-policy; # Reference the IPSec policy here.
}
}
}
ike {
proposal es-ike-proposal { # Define your IKE proposal specifications here.
authentication-method pre-shared-keys;
dh-group group2;
authentication-algorithm sha1;
encryption-algorithm 3des-cbc;
lifetime-seconds 3600;
}
policy 10.1.15.2 { # Define your IKE policy specifications here.
mode main;
proposals es-ike-proposal; # Reference the IKE proposal here.
pre-shared-key ascii-text "$9$TF6ABIcvWxp0WxNdg4QFn";
## The unencrypted preshared key for this example is juniper.
}
}
}
firewall {
filter es-traffic { # Define a filter that sends traffic to the IPSec tunnel here.
term to-es {
from {
source-address {
10.1.12.0/24;
}
destination-address {
10.1.56.0/24;
}
}
then {
count ipsec-tunnel;
ipsec-sa sa-dynamic;
}
}
term other {
then accept;
}
}
filter es-return { # Define a filter that matches return IPSec traffic here.
term return {
from {
source-address {
10.1.56.0/24;
}
destination-address {
10.1.12.0/24;
}
}
then accept;
}
}
}

On Router 3, enable OSPF as the underlying routing protocol to connect to Routers 2 and 4. Configure a bidirectional IKE dynamic SA called sa-dynamic at the [edit security ipsec security-association] hierarchy level. Use the same policies and proposals that you used on Router 2.

For your IKE policy and proposal, use preshared keys for the authentication method, SHA-1 for the authentication algorithm, 3DES-CBC for encryption, group 2 for the Diffie-Hellman group, main mode, 3600 seconds for the lifetime, and a preshared key of juniper for the initial IKE negotiation. For your IPSec policy and proposal, use ESP for the protocol, HMAC-SHA1-96 for authentication, 3DES-CBC for encryption, 28800 seconds for the lifetime, and group 2 for the PFS group.

To direct traffic into the ES PIC and the IPSec tunnel, create two firewall filters. The es-traffic filter matches inbound traffic from Router 4 destined for Router 1, whereas the es-return filter matches the return path from Router 1 to Router 4. Apply the es-traffic filter to the so-0/0/0 interface; then apply both the es-return filter and the sa-dynamic SA to the es-0/3/0 interface.

Router 3

[edit]
interfaces {
so-0/0/0 {
description "To R4 so-0/0/0";
unit 0 {
family inet {
filter {
input es-traffic; # Apply a filter that sends traffic to the IPSec tunnel here.
}
address 10.1.56.1/30;
}
}
}
so-0/0/1 {
description "To R2 so-0/0/1";
unit 0 {
family inet {
address 10.1.15.2/30;
}
}
}
es-0/3/0 {
unit 0 {
tunnel { # Specify the IPSec tunnel endpoints here.
source 10.1.15.2;
destination 10.1.15.1;
}
family inet {
ipsec-sa sa-dynamic; # Apply the dynamic SA here.
filter {
input es-return; # Apply the filter that matches return IPSec traffic here.
}
}
}
}
lo0 {
unit 0 {
family inet {
address 10.0.0.3/32;
}
}
}
}
routing-options {
router-id 10.0.0.3;
}
protocols {
ospf {
area 0.0.0.0 {
interface so-0/0/0.0;
interface so-0/0/1.0;
interface lo0.0;
}
}
}
security {
ipsec {
proposal es-ipsec-proposal { # Define your IPSec proposal specifications here.
protocol esp;
authentication-algorithm hmac-sha1-96;
encryption-algorithm 3des-cbc;
lifetime-seconds 28800;
}
policy es-ipsec-policy { # Define your IPSec policy specifications here.
perfect-forward-secrecy {
keys group2;
}
proposals es-ipsec-proposal; # Reference the IPSec proposal here.
}
security-association sa-dynamic { # Define your dynamic SA here.
mode tunnel;
dynamic {
ipsec-policy es-ipsec-policy; # Reference the IPSec policy here.
}
}
}
ike {
proposal es-ike-proposal { # Define your IKE proposal specifications here.
authentication-method pre-shared-keys;
dh-group group2;
authentication-algorithm sha1;
encryption-algorithm 3des-cbc;
lifetime-seconds 3600;
}
policy 10.1.15.1 { # Define your IKE policy specifications here.
mode main;
proposals es-ike-proposal; # Reference the IKE proposal here.
pre-shared-key ascii-text "$9$TF6ABIcvWxp0WxNdg4QFn";
## The unencrypted preshared key for this example is juniper.
}
}
}
firewall {
filter es-traffic { # Define a filter that sends traffic to the IPSec tunnel here.
term to-es {
from {
source-address {
10.1.56.0/24;
}
destination-address {
10.1.12.0/24;
}
}
then {
count ipsec-tunnel;
ipsec-sa sa-dynamic;
}
}
term other {
then accept;
}
}
filter es-return { # Define a filter that matches return IPSec traffic here.
term return {
from {
source-address {
10.1.12.0/24;
}
destination-address {
10.1.56.0/24;
}
}
then accept;
}
}
}

On Router 4, provide basic OSPF connectivity to Router 3.

Router 4

[edit]
interfaces {
so-0/0/0 {
description "To R3 so-0/0/0";
unit 0 {
family inet {
address 10.1.56.2/30;
}
}
}
lo0 {
unit 0 {
family inet {
address 10.0.0.4/32;
}
}
}
}
routing-options {
router-id 10.0.0.4;
}
protocols {
ospf {
area 0.0.0.0 {
interface so-0/0/0.0;
interface lo0.0;
}
}
}
[Contents] [Prev] [Next] [Index] [Report an Error]

Copyright © 2008, Juniper Networks, Inc. All rights reserved. Trademark Notice.