Seguridad y Redes

Una WAN tiene un dispositivo DTE en un extremo y un dispositivo DCE en el otro.
DTE: Equipo del cliente
DCE: equipo propiedad del proveedor

Conectamos dos routers con un cable DCE-DTE (Back to Back), el DCE nos debe de proporcionar el clock rate.

DCE#conf t
DCE(config)#int serial0
DCE(config-if)#ip address 2.2.2.1 255.255.255.252
DCE(config-if)#no shut
DCE(config-if)#clock rate ?
Speed (bits per second)
1200
2400
4800
9600
19200
38400
56000
64000
72000
125000
148000
250000
500000
800000
1000000
1300000
2000000
4000000

-300-4000000-    Choose clockrate from list above

DCE(config-if)#clock rate 56000
DCE(config-if)#end
DCE#
DCE#show ip int brief
Interface              IP-Address      OK? Method Status                Protocol
Ethernet0              unassigned      YES unset  administratively down down
Serial0                2.2.2.1         YES manual up                    up 
Serial1                unassigned      YES unset  administratively down down
DCE#
DCE#show controllers serial 0
HD unit 0, idb = 0xC6CF8, driver structure at 0xCC178
buffer size 1524  HD unit 0, V.35 DCE cable, clockrate 56000
cpb = 0x21, eda = 0x4800, cda = 0x4814
RX ring with 16 entries at 0x214800
00 bd_ptr=0x4800 pak=0x1E5DCC ds=0x2187C4 status=80 pak_size=22
01 bd_ptr=0x4814 pak=0x1E7DCC ds=0x21F384 status=80 pak_size=104
02 bd_ptr=0x4828 pak=0x1E7BCC ds=0x21ECC8 status=80 pak_size=104
03 bd_ptr=0x483C pak=0x1E79CC ds=0x21E60C status=80 pak_size=104
04 bd_ptr=0x4850 pak=0x1E77CC ds=0x21DF50 status=80 pak_size=22
05 bd_ptr=0x4864 pak=0x1E75CC ds=0x21D894 status=80 pak_size=22
06 bd_ptr=0x4878 pak=0x1E73CC ds=0x21D1D8 status=80 pak_size=275
07 bd_ptr=0x488C pak=0x1E71CC ds=0x21CB1C status=80 pak_size=22
08 bd_ptr=0x48A0 pak=0x1E6FCC ds=0x21C460 status=80 pak_size=22
09 bd_ptr=0x48B4 pak=0x1E6DCC ds=0x21BDA4 status=80 pak_size=22
10 bd_ptr=0x48C8 pak=0x1E6BCC ds=0x21B6E8 status=80 pak_size=22
11 bd_ptr=0x48DC pak=0x1E69CC ds=0x21B02C status=80 pak_size=22
12 bd_ptr=0x48F0 pak=0x1E67CC ds=0x21A970 status=80 pak_size=22
13 bd_ptr=0x4904 pak=0x1E65CC ds=0x21A2B4 status=80 pak_size=275
14 bd_ptr=0x4918 pak=0x1E63CC ds=0x219BF8 status=80 pak_size=22
15 bd_ptr=0x492C pak=0x1E61CC ds=0x21953C status=80 pak_size=22
16 bd_ptr=0x4940 pak=0x1E5FCC ds=0x218E80 status=80 pak_size=22
cpb = 0x21, eda = 0x503C, cda = 0x503C
TX ring with 4 entries at 0x215000
00 bd_ptr=0x5000 pak=0x000000 ds=0x230AA8 status=80 pak_size=22
01 bd_ptr=0x5014 pak=0x000000 ds=0x230AA8 status=80 pak_size=22
02 bd_ptr=0x5028 pak=0x000000 ds=0x230AA8 status=80 pak_size=22
03 bd_ptr=0x503C pak=0x000000 ds=0x230AA8 status=80 pak_size=22
04 bd_ptr=0x5050 pak=0x000000 ds=0x230AA8 status=80 pak_size=22
0 missed datagrams, 0 overruns
0 bad datagram encapsulations, 0 memory errors
0 transmitter underruns
0 residual bit errors

DTE#conf t
DTE(config)#int serial0
DTE(config-if)#ip address 2.2.2.2 255.255.255.252
DTE(config-if)#no shut
DTE(config-if)#end
DTE#
DTE#show ip int brief
Interface              IP-Address      OK? Method Status                Protocol
BRI0                   unassigned      YES unset  administratively down down
BRI0:1                 unassigned      YES unset  administratively down down
BRI0:2                 unassigned      YES unset  administratively down down
Ethernet0              unassigned      YES unset  administratively down down
Serial0                2.2.2.2         YES manual up                    up
Serial1                unassigned      YES unset  administratively down down
Serial2                unassigned      YES unset  administratively down down
Serial3                unassigned      YES unset  administratively down down
DTE#
DTE#ping 2.2.2.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2.2.2.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 32/33/36 ms
DTE#
DTE#show controllers serial 0
HD unit 0, idb = 0xB7570, driver structure at 0xBC8B0
buffer size 1524  HD unit 0, V.35 DTE cable
cpb = 0x22, eda = 0x4050, cda = 0x4064
RX ring with 16 entries at 0x224000
00 bd_ptr=0x4000 pak=0x147A20 ds=0x227908 status=80 pak_size=104
01 bd_ptr=0x4014 pak=0x149B98 ds=0x22EB84 status=80 pak_size=104
02 bd_ptr=0x4028 pak=0x1499A0 ds=0x22E4C8 status=80 pak_size=22
03 bd_ptr=0x403C pak=0x1497A8 ds=0x22DE0C status=80 pak_size=278
04 bd_ptr=0x4050 pak=0x1495B0 ds=0x22D750 status=80 pak_size=22
05 bd_ptr=0x4064 pak=0x1491C0 ds=0x22C9D8 status=80 pak_size=22
06 bd_ptr=0x4078 pak=0x148FC8 ds=0x22C31C status=80 pak_size=22
07 bd_ptr=0x408C pak=0x148DD0 ds=0x22BC60 status=80 pak_size=22
08 bd_ptr=0x40A0 pak=0x148BD8 ds=0x22B5A4 status=80 pak_size=278
09 bd_ptr=0x40B4 pak=0x1489E0 ds=0x22AEE8 status=80 pak_size=22
10 bd_ptr=0x40C8 pak=0x1487E8 ds=0x22A82C status=80 pak_size=22
11 bd_ptr=0x40DC pak=0x1485F0 ds=0x22A170 status=80 pak_size=22
12 bd_ptr=0x40F0 pak=0x1483F8 ds=0x229AB4 status=80 pak_size=22
13 bd_ptr=0x4104 pak=0x148200 ds=0x2293F8 status=80 pak_size=22
14 bd_ptr=0x4118 pak=0x148008 ds=0x228D3C status=80 pak_size=104
15 bd_ptr=0x412C pak=0x147E10 ds=0x228680 status=80 pak_size=104
16 bd_ptr=0x4140 pak=0x147C18 ds=0x227FC4 status=80 pak_size=104
cpb = 0x22, eda = 0x4850, cda = 0x4850
TX ring with 4 entries at 0x224800
00 bd_ptr=0x4800 pak=0x000000 ds=0x2476B8 status=80 pak_size=104
01 bd_ptr=0x4814 pak=0x000000 ds=0x2476B8 status=80 pak_size=22
02 bd_ptr=0x4828 pak=0x000000 ds=0x2476B8 status=80 pak_size=22
03 bd_ptr=0x483C pak=0x000000 ds=0x25C1D8 status=80 pak_size=275
04 bd_ptr=0x4850 pak=0x000000 ds=0x2476B8 status=80 pak_size=104
0 missed datagrams, 0 overruns
0 bad datagram encapsulations, 0 memory errors
0 transmitter underruns
0 residual bit errors