Suricata

Suricata doesn't detect part of IKEv2 traffic.

Some devices (Mikrotik for example) allows to start IKEv2 traffic on port 4500 (not affected by NAT Traversal enabled). In the case of UDP 4500 for IKEv2 selected, this IKEv2 traffic is not detected by Suricata. The traffic is detected as normal UDP traffic, but not recognized as IKEv2.

Mikrotik RB951G-2HNd (mipsbe), RouterOS 6.44

# suricata --build-info
This is Suricata version 4.1.0-dev (rev 8709a20d)
Features: NFQ PCAP_SET_BUFF AF_PACKET HAVE_PACKET_FANOUT LIBCAP_NG LIBNET1.1 HAVE_HTP_URI_NORMALIZE_HOOK PCRE_JIT HAVE_NSS HAVE_LUA HAVE_LUAJIT HAVE_LIBJANSSON TLS MAGIC RUST 
SIMD support: none
Atomic intrisics: 1 2 4 8 byte(s)
64-bits, Little-endian architecture
GCC version 6.3.0 20170516, C version 199901
compiled with _FORTIFY_SOURCE=2
L1 cache line size (CLS)=64
thread local storage method: __thread
compiled with LibHTP v0.5.28, linked against LibHTP v0.5.28

Suricata Configuration:
  AF_PACKET support:                       yes
  eBPF support:                            no
  XDP support:                             no
  PF_RING support:                         no
  NFQueue support:                         yes                                                                                                                       
  NFLOG support:                           no
  IPFW support:                            no
  Netmap support:                          no
  DAG enabled:                             no
  Napatech enabled:                        no
  WinDivert enabled:                       no

  Unix socket enabled:                     yes
  Detection enabled:                       yes

  Libmagic support:                        yes
  libnss support:                          yes
  libnspr support:                         yes
  libjansson support:                      yes
  liblzma support:                         yes
  hiredis support:                         yes
  hiredis async with libevent:             no
  Prelude support:                         no
  PCRE jit:                                yes
  LUA support:                             yes, through luajit
  libluajit:                               yes
  libgeoip:                                yes
  Non-bundled htp:                         yes
  Old barnyard2 support:                   no
  Hyperscan support:                       yes
  Libnet support:                          yes
  liblz4 support:                          yes

  Rust support:                            yes (default)
  Rust strict mode:                        no
  Rust debug mode:                         no
  Rust compiler:                           rustc 1.30.0 (da5f414c2 2018-10-24)
  Rust cargo:                              cargo 1.30.0 (36d96825d 2018-10-24)

  Install suricatasc:                      yes
  Install suricata-update:                 no

  Profiling enabled:                       no
  Profiling locks enabled:                 no

Development settings:
  Coccinelle / spatch:                     no
  Unit tests enabled:                      no
  Debug output enabled:                    no
  Debug validation enabled:                no

Generic build parameters:
  Installation prefix:                     /usr
  Configuration directory:                 /etc/suricata/
  Log directory:                           /var/log/suricata/

  --prefix                                 /usr
  --sysconfdir                             /etc
  --localstatedir                          /var
  --datarootdir                            /usr/share

  Host:                                    x86_64-pc-linux-gnu
  Compiler:                                gcc (exec name) / gcc (real)
  GCC Protect enabled:                     yes
  GCC march native enabled:                no
  GCC Profile enabled:                     no
  Position Independent Executable enabled: yes
  CFLAGS                                   -g -O2 -fdebug-prefix-map=/STAMUS/SELKS/Suricata/suricata-2019013001=. -fstack-protector-strong -Wformat -Werror=format-security -I${srcdir}/../rust/gen/c-headers
  PCAP_CFLAGS                               -I/usr/include
  SECCFLAGS