| 1.1.1.1 |
| 19-Mar-2026 |
christos | Import tcpdump 4.99.6 (previous was 4.99.5)
Tuesday, December 30, 2025 / The Tcpdump Group
Summary for 4.99.6 tcpdump release
Remove protocol decoding for:
OTV (draft-hasmit-otv-04, this Internet-Draft is no longer active).
Refine protocol decoding for:
DNS: Use ND_TCHECK_LEN() instead of a custom bounds check.
IPv6: Add a missing comma and remove a colon in the output.
TCP: Note if the Urgent Pointer is non-zero while URG flag not set,
if the verbose level is > 1 (option -vv and more).
TCP: Note if the Acknowledgment Number is non-zero while ACK flag not set,
if the verbose level is > 1 (option -vv and more).
TCP: Fix Reset segment processing.
IP, IPv6: Fix setting the snapshot length for the payload.
IP: Use ND_TTEST_LEN() instead of a custom bounds check.
frag6: Add a bounds check in non-verbose mode.
PTP: Remove spaces before colons in output.
PTP: Fix management packet fields.
ISO: Avoid undefined behavior and integer overflow in the Fletcher
checksum calculation.
NFS: Delete dead code.
BOOTP: Use an uint16_t variable to get the result of a GET_BE_U_2().
ZEP: use the existing NTP time formatting code.
NTP: Fix p_ntp_time_fmt() using epoch 1/epoch 2 convention (RFC 4330).
NTP: Update a field name with the RFC 5905 name (Origin Timestamp).
IPv6 mobility: Modernize packet parsing and make fixes.
IP6OPTS: Modernize packet parsing and make fixes.
VXLAN: Add UDP port 8472 used by Linux as the default port.
EGP: Replace custom code with tok2str(); Modernize packet parsing and
fix printing with -v option.
User interface:
Add optional unit suffix on -C file size.
Improve the handling of size suffixes for -C.
Print errors for options -A, -x[x] and -X[X] (mutually exclusive).
Print errors about -C, -G and -z options usage.
For PCAP_ERROR_CAPTURE_NOTSUP, show the error message provided
by libpcap for that error if it's non-empty.
Update the -z option processing. Print "invalid option -- z" when it is.
Add the -g option, causing IPv4 output in verbose mode to be on one line.
Other:
Avoid race condition when receiving signal during shutdown.
Always show the interface name in error messages when the
interface can't be opened.
Clean up the message shown if a -i flag is specified with an
interface index that's too large.
Source code:
Fix '-tt' option printing when time > 2106-02-07T06:28:15Z.
Add sub-second packet timestamp checks for invalid micro/nano.
Remove unused missing/snprintf.c.
Fix incompatible pointer types with time functions calls on Windows.
Use C99 macros to define 64-bit constants and maximum 64-bit values.
Windows:
Fixed to find wpcap.dll if WinPcap isn't installed and Npcap was
installed without the WinPcap API compatibility option. (GitHub
issue #1226).
Building and testing:
Makefile.in: Use a local libpcap in the releasecheck target.
CMake: Fix build with CMake 3.31.
autotools, CMake: don't separately test whether snprintf(3) is
available and whether it's suitable - the test for whether it's
suitable also fails if it's unavailable.
CMake: Skip snprintf(3) tests when cross-compiling.
autotools, CMake: fix issues with snprintf test and sanitizers.
CMake: check whether check_c_source_runs() works, treat the build
as a cross-compile if it doesn't work.
Autoconf: Use AC_SYS_YEAR2038_RECOMMENDED when possible if the
environment variable BUILD_YEAR2038 = yes (via autogen.sh).
Autoconf: Avoid incorrectly include the libpcap's config.h.
Autoconf: Refine reporting of os-proto.h.
Require config.h to be from the tcpdump build.
AppVeyor: Update Npcap SDK to 1.15.
autogen.sh: Allow to configure Autoconf warnings.
autogen.sh: Delete all trailing blank lines at end of configure.
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