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Yavipind 0.9.6

Yavipind 0.9.6 Download Summary

  • Language: C/C++
  • Platform: Linux / BSD
  • License: GPL - GNU Public License
  • Databases: N/A
  • Downloads: 496
  • Released: May 30, 2007

Yavipind 0.9.6 Description

Yavipind is a secure tunnel aka 2 peers securely forwarding packets toward each other. It forwards any kind of packet (IPv4, IPv6 or other) sent over the virtual point-to-point device (e.g. tun0). It fully runs in linux userspace.

Features:Network efficiency:
- small packet overhead: 26bytes (e.g. ESP with DES MD5 is 32byte)
- Packet compression: Forwarded packets may be compressed using deflate (gzip). (WORK: add stat about efficiency)
- NAT compatible: yavipin's tunnel may be establish over NAT as all packets of a tunnel are sent over a single UDP/IPv4 connection. Moreover the peer unreachability detection periodically send packets which prevent the NAT engine from timing out the connection state.
- Peer unreachabilty detection: If the other peer becomes unreachable, it will be detected. It is done ala IPv6 neighbours discovery (rfc2461.7).
- Gracefull shutdown: If a peer purposely stops, it will notify the other which is immediatly aware of it.
Usage's simplicity:
- Fully in userspace: No need to recompile the kernel
- reuse existing tools: As yavipin use a virtual device, it is possible to apply to the tunnel any tool designed for network device. For example, it is possible to set up a firewall using ipchains/netfilter or to do traffic shapping using the kernel's traffic control (see tc).
Security's strength:
- packet security: each packet exchanged during the connection is encrypted using blowfish CFB and authenticated with HMAC-MD5 96bits.
- protection against packet replay: It uses strict anti-replay and no packet can be accepted twice. A eavedropper can't take a packet, keep it for a while and make it accept a second time by the destination.
- Efficient session key renewal: It uses hash chains for efficiency. It allows smooth key transition not to cause any packet loss during the renewal. It provides forward secrecy inside the connection.
- Protect DoS ala TCP syn : It uses cookie exchange (rfc2522.3) during the connection establishement.
- Forward secrecy : Even if the attacker cracks the box, he won't be able to decrypt network traffic older than a given delay (default 10min). The diffie-hellman private key and the session key are periodically renewed and securely erased from memory.

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