| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <20080723235514.GA8992@zenon.in.qult.net> Date: Thu, 24 Jul 2008 01:55:14 +0200 From: Ignacy Gawedzki <lkml@...t.net> To: linux-kernel@...r.kernel.org Subject: TUN/TAP hacking Hi, I need some advice from network stack experts, so I hope this is the right place to ask. I thought I'd be able to use the TAP interfaces to create some sort of a network emulator. For a start I just "bridged" two tap interfaces, much in the same way as the example of br_select.c from http://vtun.sf.net , assigned both interfaces different IPv4 addresses (both with a /32 prefix), set them up and tried to transmit a UDP packet from one address to the other through the bridge. Both logs from my bridge program and tcpdump tell me that the packets are flowing as expected, but somehow the destination process doesn't get the packets (despite all correct bind, etc). Is it simply that the stack inconditionally drops any packet with the same source (IP and/or MAC) address as some local interface? As ARP resolution seems not to work either (I had to put permanent entries in the neighbor table), I suppose this is the case indeed. Could anyone confirm that? (please CC me, I've not subscribed) Thanks, Ignacy -- If you're not living on the edge, you're taking up too much space. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists