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  • HP to Cisco spanning tree root flapping

    - by Tim Brigham
    Per a recent question I recently configured both my HP (2x 2900) and Cisco (1x 3750) hardware to use MSTP for interoperability. I thought this was functional until I applied the change to the third device (HP switch 1 below) at which time the spanning tree root started flapping causing performance issues (5% packet loss) between my two HP switches. I'm not sure why. HP Switch 1 A4 connected to Cisco 1/0/1. HP Switch 2 B2 connected to Cisco 2/0/1. HP Switch 1 A2 connected to HP Switch 2 A1. I'd prefer the Cisco stack to act as the root. EDIT: There is one specific line - 'spanning-tree 1 path-cost 500000' in the HP switch 2 that I didn't add and was preexisting. I'm not sure if it could have the kind of impact that I'm describing. I'm more a security and monitoring guy then networking. EDIT 2: I'm starting to believe the problem lies in the fact that the value for my MST 0 instance on the Cisco is still at the default 32768. I worked up a diagram: This is based on every show command I could find for STP. I'll make this change after hours and see if it helps. Cisco 3750 Config: version 12.2 spanning-tree mode mst spanning-tree extend system-id spanning-tree mst configuration name mstp revision 1 instance 1 vlan 1, 40, 70, 100, 250 spanning-tree mst 1 priority 0 vlan internal allocation policy ascending interface TenGigabitEthernet1/1/1 switchport trunk encapsulation dot1q switchport mode trunk ! interface TenGigabitEthernet2/1/1 switchport trunk encapsulation dot1q switchport mode trunk ! interface Vlan1 no ip address ! interface Vlan100 ip address 192.168.100.253 255.255.255.0 ! Cisco 3750 show spanning tree: show spanning-tree MST0 Spanning tree enabled protocol mstp Root ID Priority 32768 Address 0004.ea84.5f80 Cost 200000 Port 53 (TenGigabitEthernet1/1/1) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 32768 (priority 32768 sys-id-ext 0) Address a44c.11a6.7c80 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Interface Role Sts Cost Prio.Nbr Type ------------------- ---- --- --------- -------- -------------------------------- Te1/1/1 Root FWD 2000 128.53 P2p MST1 Spanning tree enabled protocol mstp Root ID Priority 1 Address a44c.11a6.7c80 This bridge is the root Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 1 (priority 0 sys-id-ext 1) Address a44c.11a6.7c80 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Interface Role Sts Cost Prio.Nbr Type ------------------- ---- --- --------- -------- -------------------------------- Te1/1/1 Desg FWD 2000 128.53 P2p Cisco 3750 show logging: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to down %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan100, changed state to down %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to up %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan100, changed state to up %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to down %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to up HP Switch 1: ; J9049A Configuration Editor; Created on release #T.13.71 vlan 1 name "DEFAULT_VLAN" untagged 1-8,10,13-16,18-23,A1-A4 ip address 100.100.100.17 255.255.255.0 no untagged 9,11-12,17,24 exit vlan 100 name "192.168.100" untagged 9,11-12,17,24 tagged 1-8,10,13-16,18-23,A1-A4 no ip address exit vlan 21 name "Users_2" tagged 1,A1-A4 no ip address exit vlan 40 name "Cafe" tagged 1,4,7,A1-A4 no ip address exit vlan 250 name "Firewall" tagged 1,4,7,A1-A4 no ip address exit vlan 70 name "DMZ" tagged 1,4,7-8,13,A1-A4 no ip address exit spanning-tree spanning-tree config-name "mstp" spanning-tree config-revision 1 spanning-tree instance 1 vlan 1 40 70 100 250 password manager password operator HP Switch 1 show spanning tree: show spanning-tree Multiple Spanning Tree (MST) Information STP Enabled : Yes Force Version : MSTP-operation IST Mapped VLANs : 2-39,41-69,71-99,101-249,251-4094 Switch MAC Address : 0021f7-126580 Switch Priority : 32768 Max Age : 20 Max Hops : 20 Forward Delay : 15 Topology Change Count : 363,490 Time Since Last Change : 14 hours CST Root MAC Address : 0004ea-845f80 CST Root Priority : 32768 CST Root Path Cost : 200000 CST Root Port : 1 IST Regional Root MAC Address : 0021f7-126580 IST Regional Root Priority : 32768 IST Regional Root Path Cost : 0 IST Remaining Hops : 20 Root Guard Ports : TCN Guard Ports : BPDU Protected Ports : BPDU Filtered Ports : PVST Protected Ports : PVST Filtered Ports : | Prio | Designated Hello Port Type | Cost rity State | Bridge Time PtP Edge ----- --------- + --------- ---- ---------- + ------------- ---- --- ---- A1 | Auto 128 Disabled | A2 10GbE-CX4 | 2000 128 Forwarding | 0021f7-126580 2 Yes No A3 10GbE-CX4 | Auto 128 Disabled | A4 10GbE-SR | Auto 128 Disabled | HP Switch 1 Logging: I removed the date / time fields since they are inaccurate (no NTP configured on these switches) 00839 stp: MSTI 1 Root changed from 0:a44c11-a67c80 to 32768:0021f7-126580 00839 stp: MSTI 1 Root changed from 32768:0021f7-126580 to 0:a44c11-a67c80 00842 stp: MSTI 1 starved for an MSTI Msg Rx on port A4 from 0:a44c11-a67c80 00839 stp: MSTI 1 Root changed from 0:a44c11-a67c80 to 32768:0021f7-126580 00839 stp: MSTI 1 Root changed from 32768:0021f7-126580 to 0:a44c11-a67c80 00839 stp: MSTI 1 Root changed from 0:a44c11-a67c80 to ... HP Switch 2 Configuration: ; J9146A Configuration Editor; Created on release #W.14.49 vlan 1 name "DEFAULT_VLAN" untagged 1,3-17,21-24,A1-A2,B2 ip address 100.100.100.36 255.255.255.0 no untagged 2,18-20,B1 exit vlan 100 name "192.168.100" untagged 2,18-20 tagged 1,3-17,21-24,A1-A2,B1-B2 no ip address exit vlan 21 name "Users_2" tagged 1,A1-A2,B2 no ip address exit vlan 40 name "Cafe" tagged 1,13-14,16,A1-A2,B2 no ip address exit vlan 250 name "Firewall" tagged 1,13-14,16,A1-A2,B2 no ip address exit vlan 70 name "DMZ" tagged 1,13-14,16,A1-A2,B2 no ip address exit logging 192.168.100.18 spanning-tree spanning-tree 1 path-cost 500000 spanning-tree config-name "mstp" spanning-tree config-revision 1 spanning-tree instance 1 vlan 1 40 70 100 250 HP Switch 2 Spanning Tree: show spanning-tree Multiple Spanning Tree (MST) Information STP Enabled : Yes Force Version : MSTP-operation IST Mapped VLANs : 2-39,41-69,71-99,101-249,251-4094 Switch MAC Address : 0024a8-cd6000 Switch Priority : 32768 Max Age : 20 Max Hops : 20 Forward Delay : 15 Topology Change Count : 21,793 Time Since Last Change : 14 hours CST Root MAC Address : 0004ea-845f80 CST Root Priority : 32768 CST Root Path Cost : 200000 CST Root Port : A1 IST Regional Root MAC Address : 0021f7-126580 IST Regional Root Priority : 32768 IST Regional Root Path Cost : 2000 IST Remaining Hops : 19 Root Guard Ports : TCN Guard Ports : BPDU Protected Ports : BPDU Filtered Ports : PVST Protected Ports : PVST Filtered Ports : | Prio | Designated Hello Port Type | Cost rity State | Bridge Time PtP Edge ----- --------- + --------- ---- ---------- + ------------- ---- --- ---- A1 10GbE-CX4 | 2000 128 Forwarding | 0021f7-126580 2 Yes No A2 10GbE-CX4 | Auto 128 Disabled | B1 SFP+SR | 2000 128 Forwarding | 0024a8-cd6000 2 Yes No B2 | Auto 128 Disabled | HP Switch 2 Logging: I removed the date / time fields since they are inaccurate (no NTP configured on these switches) 00839 stp: CST Root changed from 32768:0021f7-126580 to 32768:0004ea-845f80 00839 stp: IST Root changed from 32768:0021f7-126580 to 32768:0024a8-cd6000 00839 stp: CST Root changed from 32768:0004ea-845f80 to 32768:0024a8-cd6000 00839 stp: CST Root changed from 32768:0024a8-cd6000 to 32768:0004ea-845f80 00839 stp: CST Root changed from 32768:0004ea-845f80 to 32768:0024a8-cd6000 00435 ports: port B1 is Blocked by STP 00839 stp: CST Root changed from 32768:0024a8-cd6000 to 32768:0021f7-126580 00839 stp: IST Root changed from 32768:0024a8-cd6000 to 32768:0021f7-126580 00839 stp: CST Root changed from 32768:0021f7-126580 to 32768:0004ea-845f80

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  • USB mouse does not work on boot

    - by Uku Loskit
    My problem is pretty much a duplicate of the one described in USB mouse late to load , but the solution there has not worked for me. I'm running the same OS and experiencing the exact same issue. It disappears after 10 seconds or so. Booting with the options specified in the other question did not fix it :/ Thanks in advance. sheepz@sheepz-desktop:~$ dmesg | egrep "hci|usb" [ 0.188000] usbcore: registered new interface driver usbfs [ 0.188000] usbcore: registered new interface driver hub [ 0.188000] usbcore: registered new device driver usb [ 0.358613] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver [ 0.358627] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver [ 0.358637] uhci_hcd: USB Universal Host Controller Interface driver [ 0.358683] uhci_hcd 0000:00:1d.0: PCI INT A -> GSI 23 (level, low) -> IRQ 23 [ 0.358691] uhci_hcd 0000:00:1d.0: setting latency timer to 64 [ 0.358695] uhci_hcd 0000:00:1d.0: UHCI Host Controller [ 0.358726] uhci_hcd 0000:00:1d.0: new USB bus registered, assigned bus number 1 [ 0.358758] uhci_hcd 0000:00:1d.0: irq 23, io base 0x0000e100 [ 0.358927] uhci_hcd 0000:00:1d.1: PCI INT B -> GSI 19 (level, low) -> IRQ 19 [ 0.358932] uhci_hcd 0000:00:1d.1: setting latency timer to 64 [ 0.358935] uhci_hcd 0000:00:1d.1: UHCI Host Controller [ 0.358964] uhci_hcd 0000:00:1d.1: new USB bus registered, assigned bus number 2 [ 0.358991] uhci_hcd 0000:00:1d.1: irq 19, io base 0x0000e200 [ 0.359132] uhci_hcd 0000:00:1d.2: PCI INT C -> GSI 18 (level, low) -> IRQ 18 [ 0.359137] uhci_hcd 0000:00:1d.2: setting latency timer to 64 [ 0.359139] uhci_hcd 0000:00:1d.2: UHCI Host Controller [ 0.359165] uhci_hcd 0000:00:1d.2: new USB bus registered, assigned bus number 3 [ 0.359193] uhci_hcd 0000:00:1d.2: irq 18, io base 0x0000e300 [ 0.359327] uhci_hcd 0000:00:1d.3: PCI INT D -> GSI 16 (level, low) -> IRQ 16 [ 0.359332] uhci_hcd 0000:00:1d.3: setting latency timer to 64 [ 0.359334] uhci_hcd 0000:00:1d.3: UHCI Host Controller [ 0.359360] uhci_hcd 0000:00:1d.3: new USB bus registered, assigned bus number 4 [ 0.359387] uhci_hcd 0000:00:1d.3: irq 16, io base 0x0000e400 [ 0.731933] usb 1-1: new full speed USB device using uhci_hcd and address 2 [ 1.023859] usb 1-2: new full speed USB device using uhci_hcd and address 3 [ 16.136175] usb 1-2: device descriptor read/64, error -110 [ 31.352481] usb 1-2: device descriptor read/64, error -110 [ 31.568485] usb 1-2: new full speed USB device using uhci_hcd and address 4 [ 46.680794] usb 1-2: device descriptor read/64, error -110 [ 61.903555] usb 1-2: device descriptor read/64, error -110 [ 62.119671] usb 1-2: new full speed USB device using uhci_hcd and address 5 [ 72.541078] usb 1-2: device not accepting address 5, error -110 [ 72.653194] usb 1-2: new full speed USB device using uhci_hcd and address 6 [ 83.066637] usb 1-2: device not accepting address 6, error -110 [ 83.178615] usb 3-1: new low speed USB device using uhci_hcd and address 2 [ 83.562546] usbcore: registered new interface driver hiddev [ 83.578827] input: Logitech USB-PS/2 Optical Mouse as /devices/pci0000:00/0000:00:1d.2/usb3/3-1/3-1:1.0/input/input3 [ 83.579016] generic-usb 0003:046D:C01D.0001: input,hidraw0: USB HID v1.10 Mouse [Logitech USB-PS/2 Optical Mouse] on usb-0000:00:1d.2-1/input0 [ 83.579244] usbcore: registered new interface driver usbhid [ 83.579246] usbhid: USB HID core driver [114025.224407] usb 3-1: USB disconnect, address 2 sheepz@sheepz-desktop:~$ dmesg | egrep "hci|usb" [ 0.188000] usbcore: registered new interface driver usbfs [ 0.188000] usbcore: registered new interface driver hub [ 0.188000] usbcore: registered new device driver usb [ 0.358613] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver [ 0.358627] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver [ 0.358637] uhci_hcd: USB Universal Host Controller Interface driver [ 0.358683] uhci_hcd 0000:00:1d.0: PCI INT A -> GSI 23 (level, low) -> IRQ 23 [ 0.358691] uhci_hcd 0000:00:1d.0: setting latency timer to 64 [ 0.358695] uhci_hcd 0000:00:1d.0: UHCI Host Controller [ 0.358726] uhci_hcd 0000:00:1d.0: new USB bus registered, assigned bus number 1 [ 0.358758] uhci_hcd 0000:00:1d.0: irq 23, io base 0x0000e100 [ 0.358927] uhci_hcd 0000:00:1d.1: PCI INT B -> GSI 19 (level, low) -> IRQ 19 [ 0.358932] uhci_hcd 0000:00:1d.1: setting latency timer to 64 [ 0.358935] uhci_hcd 0000:00:1d.1: UHCI Host Controller [ 0.358964] uhci_hcd 0000:00:1d.1: new USB bus registered, assigned bus number 2 [ 0.358991] uhci_hcd 0000:00:1d.1: irq 19, io base 0x0000e200 [ 0.359132] uhci_hcd 0000:00:1d.2: PCI INT C -> GSI 18 (level, low) -> IRQ 18 [ 0.359137] uhci_hcd 0000:00:1d.2: setting latency timer to 64 [ 0.359139] uhci_hcd 0000:00:1d.2: UHCI Host Controller [ 0.359165] uhci_hcd 0000:00:1d.2: new USB bus registered, assigned bus number 3 [ 0.359193] uhci_hcd 0000:00:1d.2: irq 18, io base 0x0000e300 [ 0.359327] uhci_hcd 0000:00:1d.3: PCI INT D -> GSI 16 (level, low) -> IRQ 16 [ 0.359332] uhci_hcd 0000:00:1d.3: setting latency timer to 64 [ 0.359334] uhci_hcd 0000:00:1d.3: UHCI Host Controller [ 0.359360] uhci_hcd 0000:00:1d.3: new USB bus registered, assigned bus number 4 [ 0.359387] uhci_hcd 0000:00:1d.3: irq 16, io base 0x0000e400 [ 0.731933] usb 1-1: new full speed USB device using uhci_hcd and address 2 [ 1.023859] usb 1-2: new full speed USB device using uhci_hcd and address 3 [ 16.136175] usb 1-2: device descriptor read/64, error -110 [ 31.352481] usb 1-2: device descriptor read/64, error -110 [ 31.568485] usb 1-2: new full speed USB device using uhci_hcd and address 4 [ 46.680794] usb 1-2: device descriptor read/64, error -110 [ 61.903555] usb 1-2: device descriptor read/64, error -110 [ 62.119671] usb 1-2: new full speed USB device using uhci_hcd and address 5 [ 72.541078] usb 1-2: device not accepting address 5, error -110 [ 72.653194] usb 1-2: new full speed USB device using uhci_hcd and address 6 [ 83.066637] usb 1-2: device not accepting address 6, error -110 [ 83.178615] usb 3-1: new low speed USB device using uhci_hcd and address 2 [ 83.562546] usbcore: registered new interface driver hiddev [ 83.578827] input: Logitech USB-PS/2 Optical Mouse as /devices/pci0000:00/0000:00:1d.2/usb3/3-1/3-1:1.0/input/input3 [ 83.579016] generic-usb 0003:046D:C01D.0001: input,hidraw0: USB HID v1.10 Mouse [Logitech USB-PS/2 Optical Mouse] on usb-0000:00:1d.2-1/input0 [ 83.579244] usbcore: registered new interface driver usbhid [ 83.579246] usbhid: USB HID core driver

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  • .htaccess non-www to www rule seems to work but the URL isn't changing in the address bar

    - by SnakeByte
    On a joomla site, apache, shared hosting, I'm using next .htaccess rule: RewriteCond %{HTTP_HOST} !^www\. RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L] The problem is that the browser's address bar text does not change from example.com to www.example.com. It seems the redirect actually works because all the links on the pages are changed to www. And after clicking on any link from there it always continues to have www added. The problem is the first page (no matter which one) that is loaded using browser's address bar - like example.com or example.com/random-page. Solved. The redirect actually works.

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  • Live Meeting error: malformed email address... or IS IT???

    - by PeterBrunone
    During a remote SharePoint training session this morning, Live Meeting presented one of our instructors with the following gem:  "An attendee email address is malformed".  This was particularly troubling since a wizard took care of adding all the entries, and they looked correct (even after being sifted through my character analysis tool).As it turns out, the addresses were indeed correct.  As sometimes happens, though, at the line breaks, it looked like there was no space between the semicolon and the following email address.  Since I'm a member in good standing of the "I wonder what this button does" school of thought, I added an extra space after each of these cramped little semicolons -- and the invitation executed flawlessly.Coincidence?  Maybe... but you can bet I'm going to keep trying dumb stuff like that when the error message doesn't make sense.  Think of it as the tech support equivalent of "Ask a silly question..."

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  • Unit testing a method with many possible outcomes

    - by Cthulhu
    I've built a simple~ish method that constructs an URL out of approximately 5 parts: base address, port, path, 'action', and a set of parameters. Out of these, only the address part is mandatory, the other parts are all optional. A valid URL has to come out of the method for each permutation of input parameters, such as: address address port address port path address path address action address path action address port action address port path action address action params address path action params address port action params address port path action params andsoforth. The basic approach for this is to write one unit test for each of these possible outcomes, each unit test passing the address and any of the optional parameters to the method, and testing the outcome against the expected output. However, I wonder, is there a Better (tm) way to handle a case like this? Are there any (good) unit test patterns for this? (rant) I only now realize that I've learned to write unit tests a few years ago, but never really (feel like) I've advanced in the area, and that every unit test is a repeat of building parameters, expected outcome, filling mock objects, calling a method and testing the outcome against the expected outcome. I'm pretty sure this is the way to go in unit testing, but it gets kinda tedious, yanno. Advice on that matter is always welcome. (/rant) (note) christmas weekend approaching, probably won't reply to suggestions until next week. (/note)

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  • How to make Evolution mail work with my work email address?

    - by Fady
    this is the 1st time to write here and the 1st time to use a mail client other than outlook. I tried to add my enterprise email address to evolution mail, I tried both server types exchange mapi and microsoft exchange. With exchange mapi i get this error message "Authentication failed. MapiLogonProvider: Failed to login into the server" With Microsoft Exchange I get this error "Could not connect to server . Make sure the URL is correct and try again." Although I'm sure of all the steps Server: ip address of the mail server Username: Domainname\Username Domain: domain name My system is Ubuntu Release 11.04 (natty) Kernel Linux 2.6.38-15-generic Genome 2.32.1 Evolution 2.32.2 Any kind of help is appreciated and thanks in advance

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  • How to use Ubuntu Touch manage-address-books.py?

    - by Rotary Heart
    Well I have been reading the docs for a few days and I found that I can "import" my contacts from a .csv file with the following: Alternatively you can import contacts from a csv file. The csv file should be in same format as /usr/share/demo-assets/contacts-data/data.csv. Replace the sample data.csv file with your own version and run manage-address-books.py create to import your contacts. But I can't figure out how to use manage-address-books.py create could anyone help me? I know that I can use syncevolution, but I want to sync my .csv file too.

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  • How can I make my Google Maps api v3 address search bar work by hitting the enter button on the keyboard?

    - by Gavin
    I'm developing a webpage and I would just like to make something more user friendly. I have a functional Google Maps api v3 and an address search bar. Currently, I have to use the mouse to select search to initialize the geocoding function. How can I make the map return a placemark by hitting the enter button on my keyboard? I just want to make it as user-friendly as possible. Here is the javascript and div, respectively, I created for the address bar: var geocoder; function initialize() { geocoder = new google.maps.Geocoder (); function codeAddress () { var address = document.getElementById ("address").value; geocoder.geocode ( { 'address': address}, function(results, status) { if (status == google.maps.GeocoderStatus.OK) { map.setCenter(results [0].geometry.location); marker.setPosition(results [0].geometry.location); map.setZoom(14); } else { alert("Geocode was not successful for the following reason: " + status); } }); } <div id="geocoder"> <input id="address" type="textbox" value=""> <input type="button" value="Search" onclick="codeAddress()"> </div> Thank you in advance for your help

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  • SMTP host name vs. domain in "From:" address vis-a-vis Email Deliverability

    - by Jared Duncan
    I'm trying to implement (or make sure that I'm correctly following) email sending best practices to improve deliverability, but the role of the smtp server's host name vs the domain name of the From: email address seems to be unclear, even after reading dozens of people's articles/input. Specifically, I understand that to satisfy the reverse DNS check, there must be a PTR record for the IP address of the sending machine that yields a domain name that matches the host name of the sending machine / SMTP server. Some say it needs to match the one given by the "hostname" command, most say it's the one provided with the HELO / EHLO statement, and this guy even says they MUST be the same (according to / enforced by what, I don't know; that's only a minor point of confusion, anyhow). First, what I can't find anywhere is whether or not the domain name of the From: email address needs to match the domain name of the SMTP server. So in my case, I have a VPS with linode. It primarily hosts a particular domain of mine, example.com, but I also sometimes do work on other projects: foo.com and bar.com. So what I'm wondering is if I can just leave the default linode PTR record (which resolves to abc.def.linode.com), make sure that abc.def.linode.com is what my mail server (qmail) is configured to say at HELO, and then proceed to use it to send out emails for example.com, foo.com, et al. If so, then I am confused by the advice given here, specifically (in a listing of bad case scenarios): No SPF record for the domain being used in the HELO command Why would THAT domain need an SPF record? And if it does, which domain should it provide whitelisting for: the HELO domain, or the domain of the From: email address (envelope sender)? Also, which domain would need to accept mail sent to [email protected]? If the domains must be the same, that would seem rather limiting to me, because then for every domain you wanted to send email from, you'd have to get another IP address for it. It would also compromise or ruin one's ability to do non-email sending things (e.g. wget) relatively anonymously. However, the upside--if this is the case--is that it would make for a far less confusing setup. I'm currently using the linode.com SMTP+PTR domain and example.com From: address combination without much of any deliverability issue, but my volume is very low and I'd like to know if someone out there has experience with larger volumes and has specifically tested the difference and/or has inside knowledge and/or has an authoritative answer (and source) for this particular question. I'm happy to clarify anything, let me know. Thanks in advance.

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  • Any way to know if two ip address points to the same machine?

    - by Vivek V K
    Is there anyway to find if two different IP address in two different network actually points to the same physical device? I need it in Linux. Edit - I have the same server(a raspberry pi) connected via 2 intranets to my client. I don't know the IP address of the server as it is DHCP. The crude way to do is to reach the raspberry pi from one intranet and check with ifconfig to find the ipadress of the machine in the other Intranet. I want to know if there is any other way I can do it? I know the mac address of the machine.But I don't know how do I find the Ipadress based on the mac address.

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  • ISC DHCP - Force clients to get a new IP address, instead of the being re-issued their previous lease's IP

    - by kce
    We are in the middle of a migration of our DHCP and DNS services from a Debian-based server to a Windows Server 2008 R2 implementation. The Debian server is running isc-dhcpd-V3.1.1. All of workstations are configured to have fixed-addresses between .3 and .40 (the motivation behind that choice is mostly management/political much like here). DHCP leases are given out in the range of .100 to .175. Statically configured servers live in the .200 block and above (which is mostly empty). When we move to the Windows platform, management/political considerations require me to move the IP ranges around again. We would like to keep .1 - .10 reserved for network appliances, switches, and other infrastructure. .200 will remain designated for servers. The addressing space in between should be available to clients and IPs should be dynamically allocated (Edit: instead of automatic as originally mentioned) by the server. My Address Pool on the Windows Server looks like this: 192.168.0.1 192.168.0.254 (Address range for distribution) 192.168.0.1 192.168.0.10 (IP addresses excluded from distribution) 192.168.0.200 192.168.0.254 (IP addresses excluded from distribution) Currently, we have all of our clients still on the .3 - .40 range, and a few machines still active in the .100 - .175 (although there are lots devices that are powered off that still have expired leases with IPs from that range). Since the lease "database" isn't shared between the old and new DHCP server how can I prevent clients from receiving a lease with an IP address that is currently being held by client with a non-expired lease from the old DHCP server? If I just expand the range on the Debian DHCP server to be 192.168.0.10 - 192.168.0.199 is there a way to force clients to not re-use their old IP address when they send their DHCPDISCOVER? Can I make the Windows DHCP server be authoritiative like the ISC implementation? The dhcpd.conf from the Debian server: ddns-update-style none; authoritative; default-lease-time 43200; #12 hours max-lease-time 86400; #24 hours subnet 192.168.0.0 netmask 255.255.255.0 { option routers 192.168.0.1; option subnet-mask 255.255.255.0; option broadcast-address 192.168.0.255; range 192.168.0.100 192.168.0.175; } host workstation-1 { hardware ethernet 00:11:22:33:44:55; fixed-address 192.168.0.3; } ... and so on until 192.168.0.40

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  • What's the piece of hardware listening on Facebook's or Wikipedia's IP address?

    - by Igor Ostrovsky
    I am trying to understand how massive sites like Facebook or Wikipedia work, for my intellectual curiosity. I read about various techniques for building scalable sites, but I am still puzzled about one particular detail. The part that confuses me is that ultimately, the DNS will map the entire domain to a single IP address, or a handful of IP addresses in the case of round-robin DNS. For example, wikipedia.org has only one type-A DNS record. So, people from all over the world visiting Wikipedia have to send a request to the one IP address specified in DNS. What is the piece of hardware that listens on the IP address for a massive site, and how can it possibly handle all the load coming from the requests for users all over the world? Edit 1: Thanks for all the responses! Anycast seems like a feasible answer... Does anyone know of a way to check whether a particular IP address is anycast-routed, so that I could verify that this really is the trick used in practice by large sites? Edit 2: After more reading on the topic, it appears that anycast is not typically used for dynamic web content. Anycast is usually used for UDP (e.g., DNS lookups), or sometimes for static content. One interesting thing to note is that Facebook uses profile.ak.fbcdn.net to host static content like style sheets and javascript libraries. Each time I ping this name, I get a response from a different IP address. However, I can't tell whether this is anycast in action, or a completely different technique. Back to my original question: as far as I can tell, even a large site will have a single expensive piece of load-balancing hardware listening on its handful of public IP addresses.

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  • Google Contacts/Calendars + Address Book + iCal: built-in sync (problems) or Exchange sync?

    - by jtbandes
    (I've looked at a few other questions related to this, but I've only found old questions with people saying that they're having problems, or anticipating Snow Leopard fixing them; no recent updates.) I'm looking to sync my Google Contacts & Calendars, and Gmail, with my Mac & iPhone. The iPhone I have currently set up thus: IMAP for Mail Exchange (Google Sync) for Contacts & Calendars The Mac: Address Book: built-in sync iCal: CalDAV, configured as a Google account I haven't been syncing Gmail to Apple Mail, because I was having weird IMAP glitches every so often that just got to annoying. Will Exchange / Google Sync work for this at all? Any suggestions there? Here are the other problems I'm having. Address Book only syncs certain fields (for example, Birthdays don't sync at all). I believe this is a list of the information that's synced. Address Book's "Synchronize with Google" checkbox doesn't stay checked when I quit Address Book. I think iCal is working fine, for the most part. Any suggestions on how to improve this setup? Why doesn't Address Book / Google Contacts sync stay enabled? Could I use Exchange for it like I am on the iPhone? Will that sync all the fields, including Birthdays, etc.? Thanks in advance!

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  • Once VPN connection is done, how do I proceed reaching the other side address space?

    - by sports
    I'm using Windows Azure and I created a VPN Site To Site, configured like this: My virtual network: My address space: 10.2.0.0/16 (65531) Subnet1: 10.2.1.0/24 (251) Subnet2: 10.2.2.0/24 (251) Gateway: 10.2.3.0/29 (3) My public gateway IP: 137.135.x.z (I wont show x and z for security reasons) This public gateway uses, as you can see, 5 IPs on subnet1 and 5 IPs on subnet2, and 5 IPs on the gateway "Their" virtual network (in azure this would be a "Local network") Their address space: 172.60.100.67/32, 172.60.100.68/32, 172.60.100.69/32 Their device public IP: x.x.x.x (ommited for security reasons) Notice their address space are 3 IPs So: the VPN is "in green" (in Azure is showing up green, literally, like these two are connected) and now my question is: How do I proceed to reach their address space? I've tried creating a virtual machine (Windows Server 2008, but it could be an Ubuntu) on "my" virtual network and it is automatically "placed" on subnet1 or subnet2. So it gets the IP 10.2.1.0 (valid example), I can't choose to place the virtual machine in the gateway address space. How do I "reach" any of the IPs 172.60.100.67, 172.60.100.68, 172.60.100.69 ? In other words: How can I telnet any of these IPs? or ping? or see them in my network? Please provide me answers for Windows Server 2008 or for an Ubuntu. I'm open to create any virtual machine.

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  • How can I make my livebox route to my external IP address for a computer in the DMZ?

    - by Noli
    I have a sagem livebox 2 (Fiber optic model), and have placed my computer in a DMZ. People from outside of my network can access my comp fine via its external dyndns.org address, yet when I try to call the public dyndns.org address from inside my network, I get redirected to the internal admin site on the router. How can I make it so that I can see my comp from the public address like everyone else? What kinds of questions should I be asking or looking into? Thanks

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  • How to set IP address of Amazon EC2 instance to its Elastic IP?

    - by TWord
    Hi, I have an Amazon EC2 instance running and I am installing a program on it that needs to know what the machine's IP address is. Can I set the Elastic IP address to the IP address within the EC2 instance? Its okay if it reroutes data packets somewhere 'outside' and then back to itself, but the software NEEDs me to specify an IP address of the machine its on. I proceeded with the software installation using the "local IP" (10.xx.xx.xx) within the software installation. I don't know if this is the reason why the application is not visible publicly (as I'm trying to determine in the question http://serverfault.com/questions/166946/allowing-web-access-to-an-amazon-ec2-windows-server-2008-instance-running-tomcat)

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  • How to set static ip address on vmware for NAT guest vms from an ubuntu Host dhcp server?

    - by javadba
    I need to configure various linux flavor NAT'ed guest vm's to have static ip addresses provided by the Ubuntu host. The vmware documentation punts on this topic, deferring to "see the man pages for your linux distribution". But the generic pages for "my linux distro" do not know about the special stuff for vmware e.g. vmnet8. Pointers from someone who just knows how to do this would be much appreciated. Here is the /etc/vmware/vmnet8/dhcpd/dhcpd.conf: allow unknown-clients; default-lease-time 1800; # default is 30 minutes max-lease-time 7200; # default is 2 hours subnet 192.168.238.0 netmask 255.255.255.0 { range 192.168.238.128 192.168.238.254; option broadcast-address 192.168.238.255; option domain-name-servers 192.168.238.2; option domain-name localdomain; default-lease-time 1800; # default is 30 minutes max-lease-time 7200; # default is 2 hours option netbios-name-servers 192.168.238.2; option routers 192.168.238.2; } host vmnet8 { hardware ethernet 00:50:56:C0:00:08; fixed-address 192.168.238.1; option domain-name-servers 0.0.0.0; option domain-name ""; option routers 0.0.0.0; } Fromt the dhcpd.conf documentation, we are supposed to add an entry for static hosts similar to the following: host mystatichostonee { hardware ethernet 00:20:6B:C7:9B:E4; fixed-address 192.168.238.101; } host mystatichosttwo { hardware ethernet 00:23:7a:C7:9c:F2; fixed-address 192.168.238.102; } But notice that the vmnet8 entry in the vmware-generated dhcpd.conf already is set to fixed-address. I don't know how to add the specifics for my hosts to that vmnet8 entry: do they become nested?

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  • Why is a network ID not needed to connect to an IP address?

    - by baddogai
    I know how IP basically works, and knows that an IP address composed of a network ID portion and a host ID portion, but when I type a IP address, say 8.8.8.8 into the web browser, I didn't supply any subnet mask information. So, how does the browser know where the dividing line is between the network ID and host ID? Since 8.8.8.8 may mean 8.8.8.8/8, 8.8.8.8/24 etc. In a nutshell, the IP address I supplied is ambiguous.

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  • What is the network address (x.x.x.0) used for?

    - by Shtééf
    It appears to be common practice to not use the first address in a subnet, that is the IP 192.168.0.0/24, or a more exotic example would be 172.20.20.64/29. The ipcalc tool I frequently use follows the same practice: $ ipcalc -n -b 172.20.20.64/29 Address: 172.20.20.64 Netmask: 255.255.255.248 = 29 Wildcard: 0.0.0.7 => Network: 172.20.20.64/29 HostMin: 172.20.20.65 HostMax: 172.20.20.70 Broadcast: 172.20.20.71 Hosts/Net: 6 Class B, Private Internet But why is that HostMin is not simply 64 in this case? The 64 address is a valid address, right? And whatever the answer, does the same apply to IPv6? Perhaps slightly related: it also appears possible to use a TCP port 0 and an UDP port 0. Are these valid or used anywhere?

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  • What is the best time to set the IP address for a server headed to a server colocation facility?

    - by jim_m_somewhere
    What is the best time to set the IP address for a server? I have a server that I am going to install the OS on and then I am going to send it to a server colocation facility. The server is going to have Internet facing services (www, email, etc.) I can set up a "fake" IP address during install (by fake I mean private as in RFC 1918) and change the "fake" IPs to the real IPs once I set up the colocation service. The other option is to set up the colocation service...wait for them to give me the "real" IPs and use them during the OS install. The ramification are that...if I use "fake" IPs during install...I will have to wait before I set up things like SSL certs. If I wait for IPs from the colocation provider...then I can set up SSL certs that use the "correct" (as in "real") IP addresses...no changes to the certs until they expire. Do the "gotchas" of changing an IP address on a server outweigh the benefits of a quick install? The other danger with using "fake" IPs is that I could make a mistake when I go through the various files to change the IP address to the "live" IP address. Server OS: CentOS 6.2 or CentOS 6.3, 64 bit. Apps: Apache 2.4.X httpd, MySQL 5.X (will eventually use replication)

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  • Static IP address on Wi-Fi at work and dynamic at home?

    - by Jason Shultz
    I need the laptops at my office to have a static IP address for security purposes and identification. However, some employees take their laptops home in the evening. If I have the Wi-Fi configuration set to use a static IP address, how can they have a dynamic IP address at home? The laptops are using Windows Vista and Windows 7.

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