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Andreas Herrmann wrote: |
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> mRyOuNg schrieb: |
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>> Andreas Herrmann wrote: |
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>>> Hi there, |
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>>> |
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>>> I want to setup a gateway / firewall solution with Gentoo. The network |
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>>> has following structure: |
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>>> |
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>>> Several host (host[1,...,x].domain.net) are defined within the DNS and |
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>>> all of them have the same A-Record with the IP 1.2.3.4 |
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>>> The gateway is listening on its external network interface with the IP |
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>>> 1.2.3.4 and has an internal interface with a private subnet |
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>>> (192.168.0.0/24). The hosts (host[1,...,x].) are addressed in this |
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>>> subnet. |
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>>> |
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>>> How can it be solved, that the gateway opens a tunnel to the special |
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>>> host in the private subnet (let.s say 192.168.0.3) if there is a query |
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>>> for host3.domain.net? |
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>>> |
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>>> In my opinion this cannot be done because the client queries the DNS |
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>>> and simply opens the connection to the IP 1.2.3.4 and the gateway has |
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>>> now hints how to decide to which internal host the tunnel should be |
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>>> opened. |
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>>> |
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>>> But this setup is possible because Microsoft ISA Server exactly does |
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>>> this job! |
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>>> |
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>>> I have no idea how to solve this. First idea was a kernel bridge |
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>>> between the interfaces. |
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>>> |
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>>> Do you have any hints for me? |
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>>> |
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>>> Thanks a lot! |
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>>> |
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>>> Andreas |
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>>> |
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>> Microsoft ISA Server is a Firewall/Proxy/Reverse-Proxy ... |
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>> |
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>> So in your case, I suppose it does a reverse proxy job (not a tunneling, |
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>> just working as a web client for internal network). |
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>> |
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>> I already replaced several ISA server with GNU/Linux solutions, with the |
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>> help of Apache and his mod_proxy ... that's imho your solution. |
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> |
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> Can this also be done for SSH und IMAP stuff? |
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> |
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It might be possible with SRV records and port redirects, but that would |
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only work with Microsoft clients that understand about this stuff. |
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If you want to know exactly what happens, run a manual HTTP session from |
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the outside to the ISA server and see what headers are returned. |
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10 to 1 ISA is proxying for all web servers, and it should tell the |
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client so in the headers. |
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|
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-- |
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