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devilwah's blog cisco, linux and all thing devilish search main menu skip to primary content skip to secondary content home confgen tool course materials (route) links cisco general it linux lunch time top links tips and tricks common cisco useful cisco commands disclaimer quotes do you remember ? man’s search for meaning wear sunscreen how to change the world the four agreements about contact me post navigation ← older posts the mystery of cisco 2960s and strange arp cache posted on may 20, 2015 by devilwah reply this all started when i introduced a new network monitoring tool on to the network, the tool was “cisco prime”, but before i say any more lets be clear the issue here has nothing to do with prime which is a great tool for managing cisco devices. i noticed that when pushing new ios files and backing up switch configuration that some time they would seem to lose network connectivity. i was able to ping them and ssh to them from my desktop, but they would simple not speak to the prime server. so lets start with the set up (ip address modified of course) prime server – a vmware guest , in vlan 1, ip address 10.10.224.98/21 my desktop – physical machine, in vlan 1 also, ip address 10.10.226.46/21 switch – management interface in vlan 666, ip address 20.20.255.6/24 interface vlan666 ip address 20.20.255.6 255.255.255.0 no ip proxy-arp end switch#sh ru int vlan 1 building configuration… current configuration : 65 bytes ! interface vlan1 no ip address no ip proxy-arp shutdown end router – 6506 with a live interface in both vlan 1 and 666 set as dfgw on clients. so to start with i can ping every thing and every thing can ping every thing else, and on the switch with a show arp i see switch#sh arp protocol address age (min) hardware addr type interface internet 20.20.255.1 0 4403.a754.8300 arpa vlan666 internet 20.20.255.6 – 7010.5c99.f241 arpa vlan666 switch# so all looking good, i can see the switch ip address and that of the dfgw switch#ping 10.10.224.98 type escape sequence to abort. sending 5, 100-byte icmp echos to 10.10.224.98, timeout is 2 seconds: !!!!! success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/6 ms but then the ping stops working? and the switch can no longer contact the prime server, however i can still see it from my desktop? logging back on to the switch i again look at the arp cache.. protocol address age (min) hardware addr type interface internet 10.10.224.99 2 0050.5683.61ce arpa vlan1 internet 20.20.255.1 0 4403.a754.8300 arpa vlan666 internet 20.20.255.6 – 7010.5c99.f241 arpa vlan666 what?? why has the switch learnt a mac address on vlan 1? i have two issues with it doing this, first prime is still trying to contact it via the dfgw ( i can see this in a packet trace) so the switch is not seeing the packets coming in on vlan 1, second the interface for vlan 1 is shut down so there should be no arp entries on it! to get it working i clear the arp cache of this entry and all is good… well for a few days / hours and then it happens again, but the time between issues seems very random. keeping an eye on it i see it happen with anther monitoring server, and then another? the one thing i notice is that all the times it happens it is always a server on vmware. physical servers/appliance and desktops never seem to have this issue. this is the first piece of the puzzle, what does vmware do different to other servers? they migrate! and when they migrate between the physical hosts the vmware system sends a gratuitous arp on to the network to alert switches what port in the network to now find the server on? and some switches that have “ip arp gleaning” switched on which is the default hear this and place an entry in to there arp table. even though the switch had the interface vlan 1 shut down, it still passed vlan1 traffic through the switch at layer 2 and this seemed to be enough that it saw the arp packet, and added the entry to its arp table. then of course the it try’s to use this entry for communication but as the interface is indeed shut it will not work! a little bit of time with cisco tac and the solution was to disable ip arp gleaning on all the access switches, it might be useful for provisioning switches but as i found it can cause issues. no ip arp gleaning tftp no ip arp gleaning udp the fact it was learning on a disabled interface is a bug and something cisco are looking in to. however that’s not quite the end of the story, disabling “ip arp gleaning” did not work! and this had us scratching out heads for a while, until one of the cisco engineers i was talking to noticed this.. cisco bug cscun38166 “no ip arp gleaning tftp and udp” doesn’t work cscun38166 description symptom: on 2960,when we configure “no ip arp gleaning tftp” and “no ip arp gleaning udp” then do tftp use command”copy flash:teset tftp:” it is expected following behavior:1.do not learn a ip address from other segment. 2.add a arp entry corresponding with hsrp virtual mac addresshowever in our case,it turns out like below: 1.generate a arp entry of ip address from other segment 2.add a arp entry corresponding with hsrp phy mac address. conditions: 1.no ip arp gleaning tftp or no ip arp gleaning udp 2.do tftp use following command copy flash:teset tftp: and looking at the version code, oh yes i would be running one of the affected versions. 15.0(2)se6, a quick upgrade to version se7 and all is good. i am impressed though, hitting 2 cisco bugs in one issue. and in the end it was prime that sorted it all out, a single click and it pushed the ios update and the configuration for “no ip arp gleaning” to all 2960s affected devices, not going to ake this a post for plugging prime, but it does have its good points. download article as pdf posted in ccnp switch , cisco , general tech | leave a reply cat 6500 vss configuration posted on june 25, 2013 by devilwah reply well i have been playing with this and was going to write up a post until i came across this how fantastic 6500 vss configuration and best practice this guys has a awesome blog, really good at putting thoughts on paper (screen) and explaining things. really suggest you head over there for a look. download article as pdf posted in general | tagged 6500 , cisco , network , vss | leave a reply notepad++ editing linux with sftp. posted on july 24, 2012 by devilwah 3 now if you haven’t tried notepad++ get over to http://notepad-plus-plus.org/ and give it a go. it is once of the best text editors i have come across, not only is is light weight and gives you tabs for you files, it also has syntax highlighting for a good number of programming and scripting languages, can be run from a usb drive with out installing and on top of all that its a free download, so perfect in every respect. nopepad++ screen shot then there is the standard “compare” functions, ability to write macros, and a whole host tool for editing text. but just a few days ago i found another function that i had not noticed before. under the plugins one of the defaults is “nppftp” clicking on this brings up a side panel that allows you to set up profiles for ftp and sftp connections to remote servers. once you have set one up (sftp for linux ) and connected the remote file system will appear in a tree structure in this pane, allow you top open the files in notepad++ edit and re-save them. and you get all the standard benefits of the application such as highlighting of code and copy paste between multiply files. one thing to be careful of is the eol settings, when creating new files, these defaults to windows format that will be miss read by the linux system (look up eol in google for more ifo on this). this can be changed either for an individual file under “edit >> elo conversion >> unix format” on the menu bar. or under “settings >> preferences >> new documents/….. ” to change the default. so that’s one bonus point about notepad++, but honestly even if this is not something you would use, give it a try, i

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Whois Information

Whois is a protocol that is access to registering information. You can reach when the website was registered, when it will be expire, what is contact details of the site with the following informations. In a nutshell, it includes these informations;

Domain Name: DEVILWAH.COM
Registry Domain ID: 1488447678_DOMAIN_COM-VRSN
Registrar WHOIS Server: whois.tucows.com
Registrar URL: http://www.tucowsdomains.com
Updated Date: 2017-07-29T23:24:07Z
Creation Date: 2008-06-06T20:23:59Z
Registry Expiry Date: 2019-06-06T20:23:59Z
Registrar: Tucows Domains Inc.
Registrar IANA ID: 69
Registrar Abuse Contact Email:
Registrar Abuse Contact Phone:
Domain Status: clientHold https://icann.org/epp#clientHold
Name Server: NS0.ZEN.CO.UK
Name Server: NS1.ZEN.CO.UK
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of whois database: 2017-10-03T10:46:29Z <<<

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Registrars.

  REGISTRAR Tucows Domains Inc.

SERVERS

  SERVER com.whois-servers.net

  ARGS domain =devilwah.com

  PORT 43

  TYPE domain

DOMAIN

  NAME devilwah.com

  CHANGED 2017-07-29

  CREATED 2008-06-06

STATUS
clientHold https://icann.org/epp#clientHold

NSERVER

  NS0.ZEN.CO.UK 212.23.8.1

  NS1.ZEN.CO.UK 212.23.3.1

  REGISTERED yes

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