Atardecer

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Se acabaron los atardeceres del verano, pero ayer me dí tiempo para tomar uno ahora que estamos en otoño, un otoño nublado.



Así lucía antier por la tarde la ciudad de Guadalajara, previo a una noche lluviosa.

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Installation of OpenWRT on Linksys EA4500 / N900 v1

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Installation of OpenWRT on Linksys EA4500 / N900 1.-  It looks like this is very important and you must not skip it!!!! Download/install last oficial firmware by Linksys Ver. 2.1.42 (Build 183584) Latest Date:  9/19/2017 Download 22.6 MB From here: http://downloads.linksys.com/downloads/firmware/FW_EA4500_2.1.42.183584_prod.img Perform the "upgrade" 2.- After the reboot, perform the install of OpenWRT. I'm not sure but my attempts to install the very latest firmware failed, so I used the version mention on this chatroom: https://forum.archive.openwrt.org/viewtopic.php?id=60649&p=1#p304557 Post #21: Edit: that image you're running now might be old enough that you should flash the factory firmware first, then flash with https://downloads.openwrt.org/snapshots … actory.bin . The board name changed from ea4500 to linksys-viper, which will prevent sysupgrade from accepting the .tar image. Link to the file: https://downloads.openwrt.org/snapsh...
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HOWTO : Find IP and/or MAC address of Brocade switch

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If you have to work with Brocade Switches and for some reason you need to find out the ip and/or the mac address of the network interface, you might have to use (at least) two options, depending on the model/firmware version. To find the IP: broc01:FID340:admin> ipaddrshow SWITCH Ethernet IP Address: 1.1.2.4 Ethernet Subnetmask: 255.255.240.0 Gateway IP Address: 1.1.2.1 DHCP: Off To find the MAC address (two options): broc01:FID340:admin> ifmodeshow eth0 but depending on the model/firmware version you might get this output: "This command is deprecated in Fabric OS v8.0.1. Please use command ethif." broc01:FID340:admin> ethif --show eth0 eth0 interface: Link mode: negotiated 100baseTx-FD, link ok MAC Address: 00:F8:72:90:56:36 eth0      Link encap:Ethernet  HWaddr 00:F8:72:90:56:36           inet addr:1.1.2.1  Bcast:1.1.2.255  Mask:255.255.2255.0           UP BROADCAST R...
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How to determine switch/port Info using tcpdump / snoop decoding CDP and/or LLDP packets

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This is a handy way to get a lot of info about the switch/port an interface is connected to. CDP stands for  Cisco Discovery Protocol , which is a layer 2 protocol and is used to share information about other directly connected Cisco equipment (WikiPedia). ## ether[20:2] == 0x2000 - Capture only packets that are starting at byte 20, and have a 2 byte value of hex 2000 LLDP stands for  Link Layer Discovery Protocol  and replaces CDP. LLDP is a vendor-neutral Data Link Layer protocol used by network devices for advertising of their identity, capabilities and neighbours (WikiPedia). ##tcpdump -i eth0 -s 1500 -XX -c 1 'ether proto 0x88cc' The folllowing command shows how to use tcpdump if you ever need switch/port info on a linux host assuming you are connected to a Cisco device: tcpdump -nn -vv -i   -s 1500 -c 1 '(ether[12:2]=0x88cc or ether[20:2]=0x2000)' Example: root@arrakis:~ # tcpdump -nn -vv -i eth0 -s 1500 -c 1 '(ether[1...
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