Category Archives: IPsec/VPN

Details about IPsec VPNs between different firewalls, etc.

Cisco AnyConnect: IPv6 Access through IPv4 VPN Tunnel

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When travelling to guest Wifis, e.g., at different customers sites, hotels, or public Wifis in general, I often have only IPv4 access to the Internet. Since I do not want to use IPv6 tunnelling protocols such as Teredo, I decided to use the Cisco AnyConnect Secure Mobility Client to tunnel IPv6 between my test laboratory (Cisco ASA) and my computer. With a few changes on the ASA, my computer now gets a private IPv4 address and a global unicast IPv6 address out of my space at home. Since I am using a VPN tunnel to access the Internet from untrusted Wifis anyway, the overall process did not change that much.

In the following, I am showing a few screenshots but not a complete configuration guide for the AnyConnect Client.

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IPsec Site-to-Site VPN Palo Alto <-> AVM FRITZ!Box

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Wer im Büro auf eine Palo Alto Networks Firewall setzt und von zu Hause hinter seiner FRITZ!Box per VPN im Büro arbeiten möchte, der muss die richtigen Einstellungen auf beiden Geräten finden. Genau das habe ich getan und stelle hier die entsprechenden Details online. Viel Spaß dabei. ;)

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IPsec Site-to-Site VPN Juniper ScreenOS <-> AVM FRITZ!Box

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Hier kommen die Einstellungen die nötig sind, um ein Site-to-Site VPN zwischen einer AVM FRITZ!Box und einer Juniper ScreenOS Firewall herzustellen. Neben einigen Anleitungen im Netz habe ich selber ein paar Einstellungen getestet, um eine möglichst detaillierte *.cfg Datei zu haben. Außerdem ist erfreulicherweise anzumerken, dass die Juniper auch ein statisches VPN zu einer dynamischen Adresse erlaubt und somit sogar beide Seite einen Verbindungsaufbau initiieren können. Mit dem VPN Monitor von Juniper wird der Tunnel konstant “up” gehalten.

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IPsec Site-to-Site VPN Palo Alto <-> Juniper ScreenOS

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For a quick documentation on how to build a Site-to-Site IPsec VPN tunnel between a Palo Alto Networks firewall and a Juniper ScreenOS device I am listing the configuration screenshots here.

It is quite easy because both firewalls implement route-based VPNs. That is: The tunnel must not be configured with Proxy IDs or the like. It is simply built upon the correct parameters for IKE and IPsec. The related traffic can then be routed into the tunnel afterwards. And since the tunnel monitor from the Palo Alto firewall triggers the tunnel to be built even though no real traffic flows through it, the admin immediately sees green status bubbles in the GUI and can be sure that the tunnel establishment was successful. Continue reading IPsec Site-to-Site VPN Palo Alto <-> Juniper ScreenOS →