6
Firewall
106
Redirect
The
source
is
told
that
there
is
a
better
route
for
a
particular
packet.
Codes
assigned
are
as
follows:
•
Code
0:
Redirect
datagrams
for
the
network
•
Code
1:
Redirect
datagrams
for
the
host
•
Code
2:
Redirect
datagrams
for
the
Type
of
Service
and
the
network
•
Code
3:
Redirect
datagrams
for
the
Type
of
Service
and
the
host
Parameter
Problem
Identifies
an
incorrect
parameter
on
the
datagram.
Echo
Reply
The
reply
from
the
destination
that
is
sent
as
a
result
of
the
Echo
Request.
Source
Quenching
The
source
is
sending
data
too
fast
for
the
receiver,
and
the
buffer
has
filled
up.
Time
Exceeded
The
packet
has
been
discarded
as
it
has
taken
too
long
to
be
delivered.
Custom IP protocol services
Services
that
run
over
IP
and
perform
application
or
transport
layer
functions
can
be
uniquely
identified
by
IP
protocol
numbers
.
IP
can
carry
data
for
a
number
of
different
protocols.
These
protocols
are
each
identified
by
a
unique
IP
protocol
number
specified
in
a
field
of
the
IP
header.
For
example,
ICMP,
IGMP,
and
EGP
have
protocol
numbers
1,
2,
and
8,
respectively.
Similar
to
the
TCP/UDP
port
ranges
described
previously,
a
range
of
IP
protocol
numbers
can
be
used
to
specify
multiple
applications
for
one
service.
For
example,
specifying
the
range
1
‐
4,7
will
match
the
protocols
ICMP
,
IGMP
,
GGP
,
IP
‐
in
‐
IP,
and
CBT
.
IP protocol numbers
The
currently
assigned
IP
protocol
numbers
and
references
are
published
by
the
Internet
Assigned
Numbers
Authority
(IANA)
and
can
be
found
at:
http://www.iana.org/assignments/protocol
‐
numbers
Example: Adding an IP protocol service
This
example
shows
how
to
add
an
IP
Protocol
service
with
the
Virtual
Router
Redundancy
Protocol
(VRRP).
Device:/>
add
Service
ServiceIPProto
VRRP
IPProto=112
