[ByTE]

Thank’s for reply.
This is really works!

But…

With NT 4 this flags does not works.
Can I set some flag to packet for detect this packet later, when this packet returns as loopback?
Maybe I can set any not used mask in INTERMEDIATE_BUFFER.m_Flags?

Any ideas?

[ByTE]

You must change all sequence values of packets in current TCP sequence.
This in hard work (not really).

[ByTE]

With TCP protocol you MUST modify SN field of packet. No other way.

[ByTE]

I read this article, but i don’t have ddk.
Anybody can say me how NDIS_FLAGS_DONT_LOOPBACK defined in header file in ddk? I need mask (0x????????).

[ByTE]

Thank’s.
I try to read this.

[ByTE]

Any comments?
How I must use INTERMEDIATE_BUFFER.m_Flags with SendPacketToAdapter?
How this flags influence sending packets?

[ByTE]

I’m understand, thank’s.

[ByTE]

Problem resolved…
with AND operator 🙂

[ByTE]

Yes, you understand me correctly.

I’m not owner of any license.
I try to test WinPKFilter.

Why only TCP/IP adapters can be filtered?
For example, you can add some flag to internal structure of packet in driver code and when program try send non TCP/IP packet to stack, driver can detect this by flag and just drop this packet…

Somtimes need simply filter any incoming packets and filtering of non TCP/IP adapters can help in this case…
In my case this is transit packets.

Thank’s for answers.

[ByTE]

Maybe I can get not only TCP/IP bound adapters info?
Because bridge removes binding of TCP/IP from adapters in bridge.
WinPKFilter works correctly with non TCP/IP bound adapters?
Just I need try to filter this adapters.

[ByTE]

I has forgotten to tell:
I can to block packets, directed to computer with bridge, but I can’t to block transit packets to other computers.

[ByTE]

Thank’s.
Problem resolved.
I set wrong flags (*_LISTEN) but after *_TUNNEL flag setted – all works fine!

I have other question now:
Why when windows XP network bridge created, and when I try to filter created virtual bridge adapter – packets not dropped 🙁 and sended to destination. I can’t to filter real adapters, because after creating bridge in adapters list contains only “Nework bridge” and “WAN connection”.
I can see packets, but when I drop them – packets sended to destination 🙁
Can you help me?

[ByTE]

I too so thought…
I tried it before I have asked, but no packets sended to other interfaces.
(even the Link/Act of adapter does not blink 🙂
May be you have small working code example in any language?

[Author]

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