Archivo de la categoría: Cisco

Redes, Configuración de Routers, Firewalls, y Switches

cisco ssh legacy Unable to negotiate with no matching key exchange method found. Their offer: diffie-hellman-group1-sha1

Error in legacy ssh switches: Unable to negotiate with no matching key exchange method found. Their offer: diffie-hellman-group1-sha1 The OpenSSH website has a page dedicated to legacy issues such as this one. It suggests the following approach, on the client: ssh -oKexAlgorithms=+diffie-hellman-group1-sha1 or more permanently, adding Host KexAlgorithms +diffie-hellman-group1-sha1 to ~/.ssh/config. This will enable the old… Leer más »


The Telharmonium (also known as the Dynamophone) was an early electrical organ, developed by Thaddeus Cahill circa 1896 and patented in 1897.[1][2][3] The electrical signal from the Telharmonium was transmitted over wires; it was heard on the receiving end by means of «horn» speakers.[4] Like the later Hammond organ, the Telharmonium used tonewheels to generate… Leer más »

Routing between vlans – Router on a Stick and Switching L3 routing

  S1#conf t S1(config)#vlan 51 S1(config-vlan)#name ENG S1(config-vlan)#vlan 52 S1(config-vlan)#name MGMT S1(config)#int gi0/0 S1(config-if)#switchport mode access S1(config-if)#switchport access vlan 51 S1(config-if)#spanning-tree portfast S1(config)#int gi0/1 S1(config-if)#switchport mode access S1(config-if)#switchport access vlan 52 S1(config-if)#spanning-tree portfast   S1#show vlan VLAN Name Status Ports —- ——————————– ——— ——————————- 1 default active Gi0/2, Gi0/3, Gi1/0, Gi1/1 Gi1/2, Gi1/3 51 ENG… Leer más »

Routing Lab —Static route

    R1#show controller S0/0 Interface Serial0/0 Hardware is GT96K DCE 530, clock rate 2000000 idb at 0x653ED468, driver data structure at 0x653F4B8C wic_info 0x653F5190 Physical Port 1, SCC Num 1 R1#sh ip int brief Interface IP-Address OK? Method Status Protocol FastEthernet0/0 unassigned YES unset administratively down down Serial0/0 unassigned YES unset administratively down down… Leer más »

Troubleshooting Switches

S1#show ip int brief S1#show interfaces status Port Name Status Vlan Duplex Speed Type Gi0/0 connected 5 auto auto unknown Gi0/1 connected 2 auto auto unknown Gi0/2 connected 1 auto auto unknown Gi0/3 connected 1 auto auto unknown Gi1/0 connected 1 auto auto unknown Gi1/1 connected 1 auto auto unknown Gi1/2 connected 1 auto auto… Leer más »

VLAN routing

Create vlans SW1#conf t SW1(config)#vlan 2 SW1(config-vlan)#name ACCT SW1(config-vlan)#exit SW1(config)#vlan 3 SW1(config-vlan)#name Sales SW1(config-vlan)#exit SW1(config)#int gigabitEthernet 0/0 SW1(config-if)#switchport access vlan 200 TRUNK PORTS Manual Configuration ( TRUNK / NONEGOTITATE) Dynamic Configuration ( Dinamic Auto / Dynamic Desirable) Dynamic Configuration DTP (Dynamic Trunking Protocol) * * SW1 Desirable -> Los dos se convierten en Trunks (Envian… Leer más »

Cisco commands

41 iperf-3 iPerf – The ultimate speed test tool for TCP, UDP and SCTP Server: iperf3 -s Client:   iperf3 -c TinyCore #!/bin/sh # Variable Assignment INTERFACE=eth0 ADDRESS= BROADCAST= GATEWAY= NETMASK= NAMESERVER1= NAMESERVER2= # Bring up the interface ifconfig $INTERFACE $ADDRESS netmask $NETMASK broadcast $BROADCAST up route add default gw $GATEWAY $INTERFACE #… Leer más »

memory router

The following outputs should be collected at the time of the memory is low – show clock show mem stat show proc mem sorted show mem all totals show log     b- represents ‘byte’, also fyi – «Total(b)» is the total amount of memory, in bytes, available for the processor after the Cisco IOS… Leer más »

On Demand Auto Attendant for CallManager Express

Posted on January 21, 2013 Rate This I’ve done my fair share of CallManager Express (CME) installations over the years, many of which were for small businesses.  I usually get to try and replace an old battleship of a phone system that has been running for a long time but has either finally given up… Leer más »

How To: Convert Audio files for use as Music on Hold for Cisco Phone Systems CME using audacity and CME configuration

1) Change Project Rate to 8000 HZ 2)Normalize to ( 0.20  -0.20 ) 3) Export Audio as other uncompressed  —->Press:  Options 4) Specify Uncompressed Options: Header: AU (Sun/NeXT) Encoding: U-Law   Configuration telephony-service moh multicast moh port 16384 route create cnf-files optional: no create cnf-files create cnf-files R2#show ephone… Leer más »