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 192.168.1.1: 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 123.123.123.123 or more permanently, adding Host 123.123.123.123 KexAlgorithms +diffie-hellman-group1-sha1 to ~/.ssh/config. This will enable the oldSeguir leyendo

Telharmonium

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 generateSeguir leyendo

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 ENGSeguir leyendo

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 downSeguir leyendo

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 autoSeguir leyendo

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 (EnvianSeguir leyendo

Cisco commands

41 iperf-3 https://iperf.fr/ iPerf – The ultimate speed test tool for TCP, UDP and SCTP Server: iperf3 -s Client:   iperf3 -c 192.168.1.1 TinyCore #!/bin/sh # Variable Assignment INTERFACE=eth0 ADDRESS=192.168.0.100 BROADCAST=192.168.0.255 GATEWAY=192.168.0.1 NETMASK=255.255.255.0 NAMESERVER1=8.8.8.8 NAMESERVER2=8.8.4.4 # Bring up the interface ifconfig $INTERFACE $ADDRESS netmask $NETMASK broadcast $BROADCAST up route add default gw $GATEWAY $INTERFACE #Seguir leyendo

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 IOSSeguir leyendo

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  music-on-hold.au  —->Press:  Options 4) Specify Uncompressed Options: Header: AU (Sun/NeXT) Encoding: U-Law   Configuration telephony-service moh flash:music-on-hold.au multicast moh 239.1.1.1 port 16384 route 192.168.1.0 192.168.2.0 192.168.3.0 create cnf-files optional: no create cnf-files create cnf-files R2#show ephoneSeguir leyendo