screenos

Juniper ScreenOS BGP Basics : a simple iBGP test case

Published November 15, 2008 |

As explained in one of my earlier posts, ScreenOS supports a couple of ways to provide for dynamic routing. Today, I’m going to explain some basic implementations of BGP on ScreenOS. Unlike my post on OSPF, I won’t be going too much into all the details of what BGP is and how it works, but […]

Posted in 001_Security, Juniper, Networking | Tagged as, autonomous system, bgp, bgp-case-juniper, dynamic, ebgp, egp, ibgp, igp, Juniper, juniper-bgp, juniper-screenos-bgp-problem, juniper-ssg5-multilink, netscreen-how-to-distribute-an-imported-route-from-igp-to-bgp, ospf, path-vector, peer, screenos, screenos-bgp, testing-juniper-screenos

Using 2 internet links with Juniper screenos Firewalls to separate traffic (pbr) and apply traffic shaping

Published October 19, 2008 |

By Peter Van Eeckhoutte (corelanc0d3r)

Scenario : you have 1 Juniper firewall, which has 2 internet connections : an expensive but reliable 4Mbit connection, and a fast, less expensive, but less reliable 20Mbit connection. Goal : use the reliable connection for smtp traffic (1Mbit) and http traffic (3Mbit), and route all other internet traffic over the other connection The techniques […]

Posted in 001_Security, Juniper, Networking | Tagged access-list, action-group, extended, gbw, how-to-monitor-traffic-shaping-in-juniper-firewall, internet, internet isp, isp, Juniper, juniper-multiple-internet-connections-configuration, juniper-on-2-internet, juniper-with-2-isp, match-group, mbw, multiple isp, pbr, policy based routing, screenos, setup-default-route-on-one-isp-on-juniper, traffic shaping

Using OSPF on Juniper Netscreen Firewalls

Published October 19, 2008 |

By Peter Van Eeckhoutte (corelanc0d3r)

Introduction to OSPF OSPF is a link-state (dynamic) routing protocol that operates within an autonomous system. OSPF falls within the group of Interior Gateway Protocols. Devices that use OSPF will advertise link state information. The devices generate Link State Advertisements (LSA’s) for directly connected links, and will forward LSAs received from other devices to ensure […]

Posted in 001_Security, Juniper, Networking | Tagged abr, access-list, area, area 0.0.0.0, asbr, designated, dijkstra, injection, Juniper, lsa, lsdb, netscreen, not-so-stubby, open shortest path first, ospf, redistribute, redistribution, route-map, screenos, stub

Building IPSec VPN with Juniper Netscreen ScreenOS (CJFV)

Published June 25, 2008 |

By Peter Van Eeckhoutte (corelanc0d3r)

A few days ago, I have posted some ScreenOS basics on this blog. Today, it is time to take it one step further and to look at setting up and especially troubleshooting IPSec VPN’s with Juniper Netscreen devices. The need for VPN A VPN can be defined as the simulation of a private connection by […]

Posted in 001_Security, Juniper, Networking | Tagged 3des, aes, aggressive mode, asic, cjfv, dh, diffie hellman, hmac, ike, ipsec, isakmp, Juniper, main mode, netscreen, phase 1, phase 2, policy based, proxy id, psk, route based, screenos, sha, vpn

Juniper Firewall ScreenOS Basics (CJFV)

Published June 22, 2008 |

By Peter Van Eeckhoutte (corelanc0d3r)

ScreenOS Concepts & Terminology The following document is based on ScreenOS v5.4.0r7.0 – Interface = connection to a specific subnet. An interface is assigned an IP address only if firewall is operating in L3 mode. Default interface names can vary on different Netscreen devices. – Zone : logical grouping of subnets and interfaces. All devices […]

Posted in 001_Security, Juniper, Networking | Tagged basic, block-intra-subnet-traffic-juniper, change-route-juniper-batch-file, cjfv, copy-image-from-ssg-firewall-to-tftp, how-to-recover-a-password-on-a-juniper-firewall, Juniper, juniper-firewall-policy-to-monitor-multiple-subnets, juniper-firewall-screenos-get-policy, juniper-firewall-set-service-ping, juniper-screenos-policy, nat-many-to-one-juniper-gui, netscreen, scp-disabled-for-root-juniper, screenos, screenos-get-time, screenos-nat-table, screenosdefault-policylog, set-filter-juniper-ssg, ssg5-config-file-scp-download

Juniper : Setting up an IPSec VPN tunnel between a Juniper Netscreen firewall/vpn device and a Cisco VPN device

Published November 17, 2007 |

By Peter Van Eeckhoutte (corelanc0d3r)

Today, I will explain the (easy) steps to set up a route-based IPSec VPN tunnel between a Juniper Netscreen firewall/VPN device and a remote Cisco device (such as Cisco ASA) If you are looking for more generic information on IPSec and building VPNs with Juniper, take a look at my blog post on VPNs with […]

Posted in 001_Security, Juniper, Networking | Tagged cisco asa, cisco-asa-permanent-ipsec, creating-tunnel-on-juniper, how-to-establish-tunnel-with-certificates-in-juniper-router, ipsec, Juniper, juniper-vpn-bind, lan-to-lan-vpn-juniper, netscreen, phase-2-no-policy-exists-for-the-proxy-id-received-local-id-juniper, proxy id, proxy-id-ike, proxy-id-setting, screenos, screenos-uptime-cli, set-vpn-proxy-id-local-ip, setting-up-a-vpn-between-a-cisco-asa-and-a-netscreen, settingupvpnbetweenajuniperandciscodevice, vpn, vpn-verbinding-juniper-cisco

Corelan Cybersecurity Research

:: Knowledge is not an object, it's a flow ::

Juniper ScreenOS BGP Basics : a simple iBGP test case

Using 2 internet links with Juniper screenos Firewalls to separate traffic (pbr) and apply traffic shaping

Using OSPF on Juniper Netscreen Firewalls

Building IPSec VPN with Juniper Netscreen ScreenOS (CJFV)

Juniper Firewall ScreenOS Basics (CJFV)

Juniper : Setting up an IPSec VPN tunnel between a Juniper Netscreen firewall/vpn device and a Cisco VPN device

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