RE: [afnog] Spoofing

[Ndungu Kahindo <nkahindo at iclk.com>]

Spoofing means that the interface is pretending to be up (as far as the
routing process is concerned).  This is only happens with dial-up (ISDN or
ASYNC) interfaces.  

As you know, the router only forwards packet to interfaces which are up, so
if an interface is down, no packets will be forwarded.  For dial-up
interfaces, they need to see packets (forwarded to them) before they come
up.  The dialer interface therefore pretends to be up so that it can receive
these packets.  When the router forwards packets to them (gorverned by the
interesting traffic access lists), the dial-up process begins to bring the
interface up. 

The interface should then change to up once the layer 2 connectivity has
been achieved.

Kahindo

-----Original Message-----
From: Richard Mikisa [mailto:rmikisa at mail.one2netmail.co.ug] 
Sent: Monday, July 14, 2003 3:43 PM
To: afnog at afnog.org

Hi all,
That is the output I get from my router, when i do a show interface. Does
anybody know what spoofing means.

kasesecob#show int d0
Dialer0 is up (spoofing), line protocol is up (spoofing)
  Hardware is Unknown
  Internet address is 169.254.0.8/24
  MTU 1500 bytes, BW 56 Kbit, DLY 20000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation PPP, loopback not set
  DTR is pulsed for 1 seconds on reset
  Last input never, output never, output hang never
  Last clearing of "show interface" counters 01:10:08
  Input queue: 1/75/0 (size/max/drops); Total output drops: 0
  Queueing strategy: weighted fair
  Output queue: 0/1000/64/0 (size/max total/threshold/drops)
     Conversations  0/0/16 (active/max active/max total)
     Reserved Conversations 0/0 (allocated/max allocated)
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     575 packets input, 14906 bytes
     5398 packets output, 335192 bytes

--
Cheers
Richard

One way to make your old car run better is to look up the price of a new
model.

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