https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=7856
Summary: Enhancement to LDP dissector to support changes
proposed in RFC 6720 - Generalized TTL Security
Mechanism (GTSM) for the Label Distribution Protocol
(LDP)
Product: Wireshark
Version: 1.8.3
Platform: All
OS/Version: All
Status: NEW
Severity: Enhancement
Priority: Low
Component: Wireshark
AssignedTo: bugzilla-admin@xxxxxxxxxxxxx
ReportedBy: gauravpatwardhan@xxxxxxxxxxx
Build Information:
Version 1.8.3 (SVN Rev Unknown from unknown)
Copyright 1998-2012 Gerald Combs <gerald@xxxxxxxxxxxxx> and contributors.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Compiled (32-bit) with GTK+ 2.20.1, with Cairo 1.8.10, with Pango 1.28.0, with
GLib 2.24.1, with libpcap, with libz 1.2.3.3, without POSIX capabilities,
without SMI, without c-ares, without ADNS, without Lua, without Python, without
GnuTLS, without Gcrypt, without Kerberos, without GeoIP, without PortAudio,
with
AirPcap.
Running on Linux 2.6.32-21-generic, with locale en_US.utf8, with libpcap
version
1.0.0, with libz 1.2.3.3, without AirPcap.
Built using gcc 4.4.3.
--
Abstract of RFC
-------------------------------------------------------------------------------
The Generalized TTL Security Mechanism (GTSM) describes a generalized use of a
packet's Time to Live (TTL) (IPv4) or Hop Limit (IPv6) to verify that the
packet was sourced by a node on a connected link, thereby protecting the
router's IP control plane from CPU utilization-based attacks. This technique
improves security and is used by many protocols. This document defines the
GTSM use for the Label Distribution Protocol (LDP).
-------------------------------------------------------------------------------
We are making changes to the LDP dissector to show the use of GTSM for LDP by
using a reserved bit in section-3.5.2 of rfc5036 (LDP).
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