Помогите разобраться с утилитой Scapy

>>> a = sr(IP(dst="87.250.250.1-100")/ICMP())
Begin emission:
*.**.*.****.******.**.**.***..**..*..*****Finished to send 100 packets.
.*..................................................................................................^C
Received 142 packets, got 30 answers, remaining 70 packets
>>> a
(<Results: TCP:0 UDP:0 ICMP:30 Other:0>, <Unanswered: TCP:0 UDP:0 ICMP:70 Other:0>)
>>> 

>>> a = sr(IP(dst="192.168.0.1-100")/ICMP())
Begin emission:
*.....WARNING: Mac address to reach destination not found. Using broadcast.
................WARNING: Mac address to reach destination not found. Using broadcast.
.............................WARNING: more Mac address to reach destination not found. Using broadcast.

>>> a = sr1(IP(dst="192.168.0.1-100")/ICMP())

[shipa@shipa-pc ~]$ sudo scapy
Пароль: 
INFO: Can't import PyX. Won't be able to use psdump() or pdfdump().
WARNING: No route found for IPv6 destination :: (no default route?)
INFO: Can't import python Crypto lib. Won't be able to decrypt WEP.
INFO: Can't import python Crypto lib. Disabled certificate manipulation tools
Welcome to Scapy (2.2.0)
>>> 
>>> 
>>> a = sr1(IP(dst="192.168.0.1-100")/ICMP())
Begin emission:
.*..................WARNING: Mac address to reach destination not found. Using broadcast.
...........WARNING: Mac address to reach destination not found. Using broadcast.
....................WARNING: more Mac address to reach destination not found. Using broadcast.
........^CWARNING: Mac address to reach destination not found. Using broadcast.
WARNING: Mac address to reach destination not found. Using broadcast.
^Z
[1]+  Stopped                 sudo scapy
[shipa@shipa-pc ~]$ 

>>> ls(IP())
version    : BitField             = 4               (4)
ihl        : BitField             = None            (None)
tos        : XByteField           = 0               (0)
len        : ShortField           = None            (None)
id         : ShortField           = 1               (1)
flags      : FlagsField           = 0               (0)
frag       : BitField             = 0               (0)
ttl        : ByteField            = 64              (64)
proto      : ByteEnumField        = 0               (0)
chksum     : XShortField          = None            (None)
src        : Emph                 = '127.0.0.1'     (None)
dst        : Emph                 = '127.0.0.1'     ('127.0.0.1')
options    : PacketListField      = []              ([])

>>> ls(ICMP())
type       : ByteEnumField        = 8               (8)
code       : MultiEnumField       = 0               (0)
chksum     : XShortField          = None            (None)
id         : ConditionalField     = 0               (0)
seq        : ConditionalField     = 0               (0)
ts_ori     : ConditionalField     = 86316378        (86316378)
ts_rx      : ConditionalField     = 86316378        (86316378)
ts_tx      : ConditionalField     = 86316378        (86316378)
gw         : ConditionalField     = '0.0.0.0'       ('0.0.0.0')
ptr        : ConditionalField     = 0               (0)
reserved   : ConditionalField     = 0               (0)
addr_mask  : ConditionalField     = '0.0.0.0'       ('0.0.0.0')
unused     : ConditionalField     = 0               (0)
>>> 

__init__(self, _pkt='', post_transform=None, _internal=0, _underlayer=None, **fields)

Help on function sr in module scapy.sendrecv:

sr(x, filter=None, iface=None, nofilter=0, *args, **kargs)
    Send and receive packets at layer 3
    nofilter: put 1 to avoid use of bpf filters
    retry:    if positive, how many times to resend unanswered packets
              if negative, how many times to retry when no more packets are answered
    timeout:  how much time to wait after the last packet has been sent
    verbose:  set verbosity level
    multi:    whether to accept multiple answers for the same stimulus
    filter:   provide a BPF filter
    iface:    listen answers only on the given interface