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• Using PVLANs with normal VLANs in a trunked environment

  - by user974896

  Assume a trunked environment with two switches, S1 and S2. The swtiches are connected with a trunk port designed to pass VLAN 26. What would happen if VLAN 26 on S2 is configured as a private-vlan with the default gateway and DHCP server and default gateway as promisc ports. What if S1's VLAN 26 is configured as a standard VLAN. Would the hosts on S1 be able to communicate with the promisc ports on S2? Would they be able to communicate with the hosts on S2? To further complicate things what if the DHCP server were to reside on S1 and I wanted S2 to have private VLANS with promisc ports as the gateway and DHCP server while still leaving S1 in a standard vlan configuration.

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• Spanning-Tree and redundant links

  - by Franko

  I have 2 switches which have redundancy between them, meaning fa0/1 on SW1 is connected to fa0/1 on SW2, and fa0/2 on SW1 is connected to fa0/2 on SW2. Both of the switches have the same BID, however the MAC address of SW1 is numerically lower, hence making it the root bridge. Now my question is, on SW2, what determines which of fa0/1 and fa0/2 becomes the RP (Root Port) and the other on blocking state?

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• How can I setup a Firewall without NAT?

  - by SRobertJames

  We have 16 IP addresses from our ISP, and are setting up a SonicWall Firewall. I'd like to have the SonicWall do NAT for the LAN, but act as a firewall only (no NAT) for the servers which are using some of the 16 addresses. How do I set this up? If I set the WAN's subnet to include the 16 IPs, the SonicWall won't route the traffic to the LAN interface. Should I set the WAN subnet to only include the ones we are dedicating for NAT, and then keep the others on the LAN? Related point: How can I set multiple IP addresses for a SonicWall LAN interface?

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• Planning office network [closed]

  - by gakhov

  I'm planning to setup my office network from scratch and want to ask professional opinions or tips. My office is connected to Internet with Cable connection (100Mb/s). The devices i would like to connect are VoIP Phone (RJ-11), TV (WiFi/LAN), 3 laptops (WiFi), a few smartphones (WiFi), iPad (WiFi), Kindle (WiFi) and, probably, MediaServer (WiFi/LAN). As you can see, the most load will be on WiFi connections (probably, even if TV supports WiFi it's better to connect it by LAN?). So, i need help to choose the best routers combination (or even one?) to support stable connections for all these devices and minimize the total number of routers/adapters. Any thoughts? Thank you!

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• Encryption over gigabit carrier ethernet

  - by Roy

  I would like to encrypt traffic between two data centres. Communication between the sites is provided as a standard provider bridge (s-vlan/802.1ad), so that our local vlan tags (c-vlan/802.1q) are preserved on the trunk. The communication traverse several layer 2 hops in the provider network. Border switches on both sides are Catalyst 3750-X with the MACSec service module, but I assume MACSec is out of the question, as I don't see any way to ensure L2 equality between the switches over a trunk, although it may be possible over a provider bridge. MPLS (using EoMPLS) would certainly allow this option, but is not available in this case. Either way, equipment can always be replaced to accommodate technology and topology choices. How do I go about finding viable technology options that can provide layer 2 point-to-point encryption over ethernet carrier networks?

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• NAT : understanding about interconnection

  - by PITCHY

  English version below J'ai 2 routeurs A et B relié en série avec les ip respectives ( 10.0.0.1/30 10.0.0.2/30) sur le routeur A j'ai activé la fonction NAT avec un pool (200.0.0.1 - 200.0.0.15/28). Lorsque je sors je prends donc un ip du pool par exemple 200.0.0.10. Comment ça fonctionne sachant que ma nouvelle ip (200.0.0.10) ne se trouve pas sur le meme réseau que mon interface de destination (10.0.0.2)? English: I have 2 routers A and B, interconnected with a serial connection, with the ip's 10.0.0.1/30 for A and 10.0.0.2/30 for B. On router A NAT was activated with the pool 200.0.0.1 - 200.0.0.15/28. When connection to this router, I get an ip from the pool, for example 200.0.0.10. Knowing my new ip is 200.0.0.10, which is not on the same network as my destination interface (10.0.0.2), how can this work?

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• Can iranians do CCNA?

  - by Mark

  I know that Iranians can not do Sun's Java certification, how about CCNA? I've heard there is no examination centers in Iran, but can I do it outside Iran?

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• Have NetFlow show true destinations...

  - by DeliriumTremens

  Currently NetFlow is showing destination (of inbound traffic) as our outside IP rather than inside IP. Also, for all outbound traffic, it is showing the source as our firewall rather than workstations. Any ideas about how to find the true source/destination for these?

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• Are neighbors formed in EIGRP and OSPF always directly connectly?

  - by xczzhh

  I always thought that neighbors formed in EIGRP were not necessarily directly connected because the only requirement for two routers to be neighbors is that they share the same Autonomous System and K-values, but it seems that I was wrong. I have looked up several books, they do not seem to give a clear answer. And I am even more confused with OSPF... Please, give me some light here. Thank you.

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• how to communicate in typical router switch router scenario?

  - by Kossel

  I'm learning routing using packet tracer simulation and I think this is a very commun scenario: let's say pc4 is the server... why I can't ping from PC1 to 192.168.2.253 (router1) but I can ping 192.168.2.2 (pc0) aren't they the same subnet? what am I missing or have to do in order to reach pc4? (192.168.100.254) from pc 1 (192.168.1.1) is there something like "default gateway" for router? thanks for advice PS: during the simulation it shows error "The routing table does not have a route to the destination IP address. The router drops the packe (from 192.168.2.253 to 192.168.1.1)"

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• Routing between same network

  - by user1389735

  Hi In this scenario there is point -to point serial connection between R6 and R7 , there is router R10 whose interface F0/0 is having ip address of 10.1.1.2/24 and there is a host machine (R9) with ip address 10.1.1.1/24 which is running an application, My problem is that Application on R9 will only work when it will get its Gateway as 10.1.1.1/24 which is of router (R10) , is there any way i can make R6 and R7 transparent for R9 and R10, Or any type of routing using GRE / Route-map or any other way. Thanks in advace

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• Why should I use a switched network over routed?

  - by SRobertJames

  Now that routers are affordable, why should I build a network using Layer 2 switches, which degenerate to broadcasting under poor conditions, and not just use real routing at Layer 3? Edit: Got some great replies. Let me clarify the question: Of course, at the lowest level, you want to plug your end nodes into a switch, not a router (as demonstrated by AlReece). I'm referring to switches which are used to bridge traffic between segments - that is, switches connected to other switches.

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• How to set up a home SIP Server/Proxy for multi ring?

  - by zio

  I have a sip account which only allows one device to be registered. When i'm at home I want incoming calls to be able to ring on multiple devices. All of these devices are connected to the local network. I'm guessing the way to do this is using a local server/proxy that would allow multiple registrations which then forwards traffic to/from my sip provider. What a simple way to do this on either OS X, Ubuntu or using some low cost SIP router hardware?

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• Why can a network address not be a valid host address?

  - by Goblinlord

  So... I have studied for CCNA and such and been working with IP networking at the least the past 8 years or so. I have always seen and been told that the network address for a subnet is not a valid host address. Now first I will start by saying I know this is true. My question is more... is there a technical reason it can not be used or was it just arbitrarily agreed upon when the specification was designed? I understand why a broadcast address can not be used (because it is ACTUALLY used). The thing is when I see a network address used it is normally only in routing which is specifically using NETWORK addresses. This being the case, (network addresses being used only when you are expecting a network address) is there some technical reason that they could not have the network address be an actual valid host address?

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• Destination host unreachable

  - by user1010101

  I have 2 router connected to 1 switch which contains two vlans, 1 router has the ip table of vlan1 and the other router have the ip table of vlan2 I have trunked both router cable to the switch. I have set 1 ip table per router which correspond to the ip address of the PC that have this router address as a gateway. When I ping from 192.168.100.2 to 192.168.200.2 it tells me that destination host is unreachable and the message is from the router 192.168.100.1. So I guess router for 192.168.100.x does not see the router for 192.168.200.x , right ? Or am I wrong ? What are good troubleshooting steps ? http://i.imgur.com/b94Ir.png is the representation of the network, i cannot post image since im not reputated enough.

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• How can a Cisco Aironet wireless card connect to a WPA encrypted network?

  - by Aibara Iduas

  I have a Thinkpad T40 running Ubuntu 10.10. I want to connect to wireless networks with WPA encryption; they appear in the network list, but are grayed out. The card does support WPA, since it works in Windows. In 10.10 the wireless works just fine with unprotected and WEP networks, but cannot connect to any WPA networks. The card is a Cisco Aironet Wireless 802.11b. I've been reading a lot of forum posts trying to find a solution, but either encounter threads where no solution was found or answers longer apply (most date from 2007, since this isn't the newest of computers). Here is the output of sudo lshw -c network: *-network:1 DISABLED description: Wireless Interface product: Cisco Aironet Wireless 802.11b vendor: AIRONET Wireless Communications physical id: 2 bus info: pci@000:02:02.0 logical name: eth1 version: 00 serial: 00:02:8a:78:6a:44 width: 32 bits clock: 33MHz capabilities: pm vpd bus_master cap_list rom ethernet physical wireless logical configuration: broadcast=yes driver=airo latency=64 maxlatency=4 mingnt=4 multicast=yes wireless=IEEE 802.11-DS Thanks, any help would be greatly appreciated!

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• IPsec VPN tunnel between Windows 2008 R2 and CISCO ASA?

  - by antur123

  I need to create a VPN IPsec tunnel between my Windows 2008 R2 server and a CISCO ASA device. I want my server to be both the end of the tunnel, and the server that connects to the other side (no need to connect a whole subnet, just the server would be fine). I found this article that seems to do the trick, but there are two differences: As mentioned above, the computer behind my end is the server itself. Can that be configured? (i.e. make the "computers in endpoint 1" IP address be the same than "local tunnel computer"). This article is for Juniper ScreenOS, not for CISCO ASA, though configurations look very similar. Would that configuration work for me?

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• flow-tools protocol numbers

  - by endroix

  When using flow-print to print the netflows into ASCII, I get 3 different values for protocols, ie protocol 1,6,17 ? What does that mean ? Thanks

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• Is it possible to access Request object from Global.asa file?

  - by Rob Segal

  I need to get access to some server variables like APPL_PHYSICAL_PATH from the the Global.asa file. I can do this on any page of my site using the Request object as follows... Request.ServerVariables("APPL_PHYSICAL_PATH") But I don't seem to have access to the Request object within the Global.asa file. Is there an equivalent call I can do here with the Server object?

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• "/etc/init.d/networking restart" with non-root user

  - by bonchen

  I have a thin client with 112mb RAM which boots ubuntu server 12.04.1 from a usb drive with openbox and it is to be used by students to communicate with cisco equipment. And because of this the students need to be able to reconfigure the network interface and then restart it without a reboot using the only user - cisco. This is what I have so far: adduser cisco usermod -a -G dialout cisco chown root:cisco /etc/network/interfaces chmod 664 /etc/network/interfaces chmod u+s /sbin/shutdown chmod u+s /sbin/reboot chmod u+s /sbin/poweroff chmod u+s /run/network/if* chmod u+s /sbin/ifdown chmod u+s /sbin/ifup And when I run /etc/init.d/networking restart as cisco I get: *Reconfiguring network interfaces... rm: cannot remove `eth0.dhclient': Permission denied Failed to send flush request: Operation not permitted RTNETLINK answers: Operation not permitted Any ideas on how to get this working? Thanks!

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• Implications of Cisco open-sourcing H.264? [on hold]

  - by Suman

  Cisco has announced that it will license and open-source the H.264 video codec. As a result of this, Firefox will be embedding H.264 playback functionality in future versions of Firefox. What implications, if any, will this have for programmers building software and/or hardware dealing with video (and WebRTC in particular)? (And if programmers.SE isn't the right forum, please feel free to suggest a better option.)

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• La mise à jour du projet Cloud OpenStack est disponible avec de nouvelles fonctionnalités et la participation de Cisco et Canonical

  La seconde mise à jour du code source de OpenStack est disponible avec de nouvelles fonctionnalités et la participation de Cisco et Canonical Mise à jour du 04/02/11, par Hinault Romaric La communauté OpenStack vient de dévoiler la seconde mise à jour de son projet open-source Cloud OpenStack dont le code source a été baptisé « Besack ». Pour mémoire OpenStack est un projet initié par la compagnie RackSpace en partenariat avec plusieurs compagnies parmi lesquelles la Nasa et Microsoft (lire ci-avant). La seconde mise à jour du projet inclut de nouvelles technologies de stockage, une prise en charge d'IPv6 et ...

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• « L'Internet partout » devrait engendrer 614 milliards de dollars de gains cette année, selon une étude de CISCO

  « L'Internet partout » devrait engendrer 614 milliards de dollars de gains cette année La manufacture à elle seule générerait 103 milliardsD'après une étude réalisée auprès de 7 500 décideurs d'entreprises répartis dans 12 pays et publiée par CISCO, « Internet of Everything » (ou IoE) devrait générer durant cette année 613 milliards de dollars dans le secteur privé. Pour le géant américain, « Internet of Everything » est l'interconnexion des personnes, des processus, des données et objets (Internet des objets dont un article

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• CD/DVD drive not mounted when inserted with Disc of any kind

  - by Cisco Sán

  I just noticed that if a insert a CD or a DVD of any kind, the Drive will start spinning but it will not show the mounted disc. Before it used to ask me what to do with the media inserted. Now it doesn't even do that. I ran in the terminal this code: eject -n and it displays this: " eject: device is `/dev/sr0'" what can I do to get the functionality back on my drive. also ran this command: sudo mount -o ro,unhide,uid=1000 /dev/cdrom /mnt/cdrom but in return i get this: " mount: mount point /mnt/cdrom does not exist" Running Ubuntu 11.10 HERE IS THE HISTORY UNTIL NOW thanks Waltinator: I ran the 'dmesg' but don't know what I'm looking for. Im a newbie on this. The same thing with the 'ls -rlt /var/log' command. Should I create the directory for the mount? at this point really don't know what to do. – Cisco Sán 7 hours ago Here are 3 lines from my dmesg after I successfully inserted a CD: [ 4804.416018] wlan0: no IPv6 routers present [ 8214.125450] ISdit ISO 9660 Extensions: Microsoft Joliet Level 3 [ 8214.136556] ISO 9660 Extensions: RRIP_1991A The first line is a previous event, my wireless going online. The next 2 lines are a good result. The number in square brackets is "seconds since boot", the rest of the line is usually helpful. And no, you should NOT create the mount point. Let's try to get the automatic mounting to work. – waltinator 7 hours ago ok this are my last 3 lines on the 'dmesg' [ 18.130819] init: plymouth-stop pre-start process (1396) terminated with status 1 [ 28.780011] wlan0: no IPv6 routers present [ 505.632119] CE: hpet increased min_delta_ns to 20113 nsec – Cisco Sán 6 hours ago It looks like your CD/DVD drive is not connected to the data bus, and not causing an interrupt when you insert a platter. – waltinator 6 hours ago Try dmesg | grep -A8 CD-ROM which should show you what the system thought was available when it came up. – waltinator 6 hours ago here is my printout [0.774351] scsi 0:0:0:0: CD-ROM HL-DT-ST DVD+-RW GSA-T40N A100 PQ: 0 ANSI: 5 [0.778117] sr0: scsi3-mmc drive: 24x/24x writer dvd-ram cd/rw xa/form2 cdda tray [0.778122] cdrom: Uniform CD-ROM driver Revision: 3.20 [0.778282] sr 0:0:0:0: Attached scsi CD-ROM sr0 [0.778340] sr 0:0:0:0: Attached scsi generic sg0 type 5 [0.780416] Freeing unused kernel memory: 984k freed [0.780732] Write protecting the kernel read-only data: 10240k [0.780986] Freeing unused kernel memory: 20k freed [0.786331] Freeing unused kernel memory: 1400k freed [0.804912] udevd[90]: starting version 173 [0.874178] r8169 Gigabit Ethernet driver 2.3LK-NAPI loaded [0.874208] r8169 0000:02:00.0: PCI INT A - GSI 16 (level, low) - IRQ 16 OK, your system sees the drive. Can you open and close the tray with eject and eject -t? Run udevadm monitor while you insert a CD (type ^C when done) and see if you get "change" and "add" messages. – waltinator 6 hours ago ok, "eject" works perfectly "eject -t" does nothing. this is the message for "udevadm monitor": KERNEL[13771.009267] change /devices/pci0000:00/0000:00:1f.1/host0/target0:0:0/0:0:0:0/block/sr0 (block) UDEV [13773.878887] change /devices/pci0000:00/0000:00:1f.1/host0/target0:0:0/0:0:0 /block/sr0 (block) – Cisco Sán 6 hours ago sudo hwinfo --cdrom (the hwinfo package is installable through Software Center) describes my CD-ROM, try it. – waltinator 4 hours ago My read out from the "sudo hwinfo --cdrom" are the following: hal.1: read hal dataprocess 2753: arguments to dbus_move_error() were incorrect, assertion "(dest) == NULL || !dbus_error_is_set ((dest))" failed in file ../../dbus/dbus-errors.c line 280. This is normally a bug in some application using the D-Bus library. libhal.c 3483 : Error unsubscribing to signals, error=The name org.freedesktop.Hal was not provided by any .service files 22: SCSI 00.0: 10602 CD-ROM (DVD) [Created at block.247] Unique ID: KD9E.JgkxTS4hgl2 Parent ID: 3p2J.gdUMCD83e+E SysFS ID: /class/block/sr0 SysFS BusID: 0:0:0:0 SysFS Device Link: /devices/pci0000:00/0000:00:1f.1/host0/target0:0:0/0:0:0:0 Hardware Class: cdrom Model: "HL-DT-ST DVD+-RW GSA-T40N" Vendor: "HL-DT-ST" Device: "DVD+-RW GSA-T40N" Revision: "A100" Driver: "ata_piix", "sr" Driver Modules: "ata_piix" Device File: /dev/sr0 (/dev/sg0) Device Files: /dev/sr0, /dev/scd0, /dev/disk/by-id/ata-HL-DT-ST_DVD+_-RW_GSA-T40N_K048BJ74257, /dev/disk/by-path/pci-0000:00:1f.1-scsi-0:0:0:0, /dev/cdrom, /dev/cdrw, /dev/dvd, /dev/dvdrw Device Number: block 11:0 (char 21:0) Features: DVD Config Status: cfg=new, avail=yes, need=no, active=unknown Attached to: #17 (IDE interface) Drive Speed: 31 Volume ID: "Movie" Publisher: "INTERVIDEO" Creation date: "20050424162207000" Thanks for the help. To Castro, hope this is what you meant and sorry for the comments..

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• Call a subroutine/function in Global.asa from an ASP page?

  - by Don Zacharias

  Hi all, In Classic ASP, shouldn't a subroutine in global.asa be available to all .asp pages in the session? For some reason I am having trouble calling the sub. Before I look at whether something specific to my application is causing the problem I wanted to make sure I understood properly. global.asa: <SCRIPT LANGUAGE="VBScript" RUNAT="Server"> sub foo session("foo") = true end sub </SCRIPT> myinclude.inc, included in all pages: call foo I get 'Type Mismatch' runtime error referencing foo. Am I totally misunderstanding this?

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