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• Linux Bridge, Samba netbios name/hostname access

  - by Christopher Wilson

  I am currently running a linux bridge in the following configuration ADSL Modem: 192.168.1.1 Linux Bridge: eth0: 192.168.1.2 eth1: no address Wireless Router: 192.168.0.1 My issue is that i cannot access the "Linux Bridge" shares using the WINS name of the server via client systems (yes i understand it is a transparent bridge but i can access it via the 192.168.1.2 address this is not on the same subnet as the client systems). This is the global section of my SMB.CONF [global] unix extensions = off os level = 20 netbios name = server guest account = nobody server string = 447 Server security = share #unix extensions = no #wins support = yes #wins server = 192.168.0.1 name resolve order = wins lmhosts hosts bcast interfaces bridge1 eth0 eth1 lo bind interfaces only = yes Can i access a bridged server using it's WINS name to access samba shares? Cheers Chris

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• IPSec VPN using ZyWALL IPSec VPN Client: unable to connect from some providers

  - by Reshi

  I'm trying to configure an IPSec VPN to one company from my home. The company has SANET internet service provider. I was able to create a VPN connection from another company that has the same internet service provider. The problem begins when I'm trying to connect from another ISP like Orange or Telekom. Here is the log from ZyWall: 20120816 10:06:18:359 Default (SA Gateway-P1) SEND phase 1 Main Mode [SA] [VID] [VID] [VID] [VID] [VID] 20120816 10:06:18:375 Default (SA Gateway-P1) RECV phase 1 Main Mode [SA] [VID] [VID] [VID] [VID] [VID] [VID] [VID] [VID] 20120816 10:06:18:390 Default (SA Gateway-P1) SEND phase 1 Main Mode [KEY_EXCH] [NONCE] [NAT_D] [NAT_D] 20120816 10:06:18:718 Default (SA Gateway-P1) RECV phase 1 Main Mode [KEY_EXCH] [NONCE] [NAT_D] [NAT_D] 20120816 10:06:18:734 Default (SA Gateway-P1) SEND phase 1 Main Mode [HASH] [ID] 20120816 10:06:18:750 Default (SA Gateway-P1) RECV phase 1 Main Mode [HASH] [ID] 20120816 10:06:18:750 Default phase 1 done: initiator id [email protected], responder id 111.112.113.114 20120816 10:06:18:765 Default (SA Gateway-Tunnel-P2) SEND phase 2 Quick Mode [HASH] [SA] [KEY_EXCH] [NONCE] [ID] [ID] 20120816 10:06:18:953 Default (SA Gateway-Tunnel-P2) RECV phase 2 Quick Mode [HASH] [SA] [KEY_EXCH] [NONCE] [ID] [ID] 20120816 10:06:18:953 Default (SA Gateway-Tunnel-P2) SEND phase 2 Quick Mode [HASH] 20120816 10:06:48:968 Default (SA Gateway-P1) SEND Informational [HASH] [NOTIFY] type DPD_R_U_THERE 20120816 10:06:48:984 Default (SA Gateway-P1) RECV Informational [HASH] [NOTIFY] type DPD_R_U_THERE_ACK ZyWall informs me that the tunnel was opened. But I can't ping or access any computer in the network. My configuration at home: ISP: Orange Optical connection Terminal: GPON OPTICAL NETWORK TERMINAL G-25E Router: TPLink TL-WR941N --> SPI Firewall Enabled --> VPN - IPSEC Passthrough Enabled I was wondering if the problem could not be on ISP side (that he blocks somehow this connection because in SANET ISP it worked fine) or even in my terminal or router. What could I check? Where could be the problem ?

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• multiple vlans routed on one nic? trunk?General? or Access?

  - by Aceth

  ok for the last week I've tried racking my head around this... I have a SRW208P with 802.1q support, and a virtual endian appliance. I would like to be able to have 3 vlans having everything routed through the endian appliance.. i.e. The Virtual server has 2 bridged NIC's to the switch. This is where I'm getting confused .. On the 8 port switch I've got the 3 vlans set up ok (all being untagged as they are not going to be vlan aware), it's the port I'm connecting the endian firewall to the switch I'm having trouble with (second nic goes to the adsl modem and NAT'd) Is it meant to be a trunk, "Genereal" or "Access" then untagged or tagged? the end goal is to have vlan traffic routing through the single NIC and have endian route vlan traffic according to the rules. Any one have any ideas on the cisco small business stuff? Thanks

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• TFTP Timing Out on Ubuntu VM

  - by valsidalv

  I'm running a Windows 7 PC with VMware installed which has my Ubuntu (10.04 Lucid Lynx). I recently installed a DHCP server and TFTP (Xinet tftpd) using these instructions. I've mapped a network drive so that my Windows has access to all the files in my VM through a 192.x.x.x IP address. I'm trying to throw some custom firmware onto a router. The router has its own built-in TFTP utility that will download the image. It successfully manages to do everything but it is slow because it writes it to flash memory. There is another method that is much quicker because it writes to RAM directly but it must use the TFTP server in Ubuntu. The issue I'm facing is that the Ubuntu TFTP transfer seems to be timing out. The transfer starts but never goes past ~60%. Here's my /etc/xinetd.d/tftp file (similar to a known working config): service tftp { protocol = udp port = 69 socket_type = dgram wait = yes user = nobody server = /usr/sbin/in.tftpd server_args = -s /home/user/tftp/ disable = no cps = 300 2 per_source = 60 } I've done some searching but can't find any parameters for this file to control timeout time or number of retries. The last two arguments (cps, per_source) and completely alien to me (can anyone explain). I have a few possible solutions but the easiest would be to get this TFTP server working. Can anyone help? Either with a timeout configuration or maybe even recommend a different TFTP server? Thanks!

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• Computer sending data while turned off

  - by Nicklas Ansman

  I have a some what strange problem (which could have and easy and obvious solution for all I know). My problem is that when I've booted ubuntu (now 10.4 but same problem with 9.10) and turns it off it starts sending a HUGE amount of data via the ethernet cable, so much in fact that my router can't handle it and stops responding. As far as I can tell the computer is completely turned off with no fans spinning. I can add that if I boot windows I do not have this problem, just when exiting ubuntu. There are two "fixes" for my problem: Pull the ethernet cable until the next boot Turn off power to the PSU and wait for the capacitors to unload Is there anyone who knows what could be going on? I'd be happy to post some logs or conf-files. Currently I'm using the ethernet port on my motherboard which is a Asus P6T Deluxe V2 with an updated version of the BIOS (maybe not the latest but since it only happens when I've been in ubuntu I don't wanna mess with the BIOS too much). Regards Nicklas ---------Update 1---------- The router is a D-Link DIR 655 with the latest firmware. ---------Update 2---------- I've now reinstalled ubuntu (with 10.4) and I still experience the same problem.

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• Cisco 3560+ipservices -- IGMP snooping issue with TTL=1

  - by Jander

  I've got a C3560 with Enhanced (IPSERVICES) image, routing multicast between its VLANs with no external multicast router. It's serving a test environment where developers may generate multicast traffic on arbitrary addresses. Everything is working fine except when someone sends out multicast traffic with TTL=1, in which case the multicast packet suppression fails and the traffic is broadcast to all members of the VLAN. It looks to me like because the TTL is 1, the multicast routing subsystem doesn't see the packets, so it doesn't create a mroute table entry. If I send out packets with TTL=2 briefly, then switch to TTL=1 packets, they are filtered correctly until the mroute entry expires. My question: is there some trick to getting the switch to filter the TTL=1 packets, or am I out of luck? Below are the relevant parts of the config, with a representative VLAN interface. I can provide more info as needed. #show run ... ip routing ip multicast-routing distributed no ip igmp snooping report-suppression ! interface Vlan44 ip address 172.23.44.1 255.255.255.0 no ip proxy-arp ip pim passive ... #show ip igmp snooping vlan 44 Global IGMP Snooping configuration: ------------------------------------------- IGMP snooping : Enabled IGMPv3 snooping (minimal) : Enabled Report suppression : Disabled TCN solicit query : Disabled TCN flood query count : 2 Robustness variable : 2 Last member query count : 2 Last member query interval : 1000 Vlan 44: -------- IGMP snooping : Enabled IGMPv2 immediate leave : Disabled Multicast router learning mode : pim-dvmrp CGMP interoperability mode : IGMP_ONLY Robustness variable : 2 Last member query count : 2 Last member query interval : 1000

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• Cisco 877 as PPPoA/PPPoE bridge (no routing) - how to make it listen to IP for management?

  - by Ingmar Hupp

  I have a Cisco 877 configured to bridge ADSL with PPPoA to PPPoE on Vlan1. This works fine, but in this mode the only way I can configure the Cisco is via the serial console. I'd like to have the Cisco also listen on an IP address so I can telnet/ssh into it. I think the right way to go about this would be via bridge irb, but I'm not sure exactly how (or if that's even the right direction). IOS is 12.4T and my current config (cut down to essentials) is: no ip routing no ip cef ! ! interface ATM0 no ip address no ip route-cache no atm ilmi-keepalive pvc 0/38 encapsulation aal5snap ! dsl operating-mode auto bridge-group 1 ! ! interface Vlan1 no ip address no ip route-cache bridge-group 1 Just setting an IP address on Vlan1 didn't have the desired effect, but surely this must be possible somehow (the Draytek Vigor 120 even does it by default).

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• Routing table on Linux not respected

  - by MRHaarmann

  I have a very specific problem, building a Linux VPN endpoint (with external VPN Gateway), which should route certain networks over the tunnel, others via default gateway. The Linux VPN should do a NAT on the outgoing connections for the VPN peers. Setup is as following: Internet gateway LAN 192.168.25.1/24 VPN Gateway LAN 10.45.99.2/24 (VPN tunnel 10.45.99.1 to net 87.115.17.40/29, separate connection to Internet) Linux VPN Router eth0 192.168.25.71/24 eth0:503 10.45.99.1/24 Default 192.168.25.1 route to 87.115.17.40/29 via 10.45.99.2 (send_redirects disabled, ip_forward enabled) Linux clients (multiple): eth0 192.168.25.x/24 Default 192.168.25.1 route to 87.115.17.40/29 via 192.168.25.71 Ping to the machines via tunnel from the VPN Router is working. Now I want to establish a routing from my clients over the VPN gateway and the client packet gets routed to 192.168.25.1 ! traceroute output shows the packets get routed to 192.168.25.71, but then to 192.168.25.1. So the route is not respected in forward ! IPTables and Routing: ip route show 87.115.17.40/29 via 10.45.99.2 dev eth0 10.45.99.0/24 dev eth0 proto kernel scope link src 10.45.99.1 192.168.25.0/24 dev eth0 proto kernel scope link src 192.168.25.71 default via 192.168.25.1 dev eth0 iptables -A INPUT -i eth0:503 -j REJECT iptables -t nat -A POSTROUTING -o eth0:503 -j MASQUERADE iptables -A FORWARD -i eth0:503 -m state --state RELATED,ESTABLISHED -j ACCEPT iptables -A FORWARD -s 192.168.25.0/24 -o eth0:503 -j ACCEPT So what is wrong with my setup ? The route is chosen correctly from localhost, but all the clients get forwarded to the Internet GW. thanks for helping, Marcus

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• Can't display RSSI values in Wireshark

  - by Giovanni Soldi

  I am trying to analyze the up-link Wireless traffic generated by my Sony Ericsson phone and captured by my D-Link router, on which I installed the DD-WRT firmware. To do this, first I log in the router and enable the prism0 interface by typing the command: wl -i eth1 monitor 1 and then I start to capture the packets by typing: tcpdump -i prism0 ether src xx:xx:xx:xx:xx:xx -s0 -w /tmp/smbshare/sony_ericsson_test.pcap where xx:xx:xx:xx:xx:xx is the MAC address of my Sony Ericsson phone. After a while I transfer the sony_ericsson_test.pcap file to my computer and open it with Wireshark program. In order to display the RSSI values I follow this procedure: Edit - Preferences... - Columns - Press "Add" button - As "Field type" I choose "IEEE 802.11 RSSI" and finally I choose name "Power" and click on "Apply" button. The problem is that the column "Power" is empty with no RSSI values. Does Anyone has a clue on why are RSSI values not displayed? Maybe I am missing a passage. Looking forward to hearing from anyone of you! Thanks in advance for your help!

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• Where should I go to learn about networking? [closed]

  - by Ollie Saunders

  I wonder if anyone could recommend resource or resources such as a good book that: explains how all the important protocols work and interact. I’m interested in those that are relevant in a typical home network and used over the Internet explains in detail how ADSL Internet connections work to the level of depth necessary so that I’m able to tweak and measure performance settings starts from the beginning but attempts to provide proper understanding rather than idiot-oriented steps to follow Basically, I’m interested in how these technologies work and tend to be implemented in hardware and software rather than “here’s what to do if…” I’m interested in Computer Networking by Andrew S. Tanenbaum and I wonder if anyone else has any experience with that title. It’s expensive but I could probably loan a copy for £3 from the library or so.

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• Weirdly high ping on direct ethernet connection?

  - by Antriel

  I bought new Lenovo IdeaCentre H430 pc and I'm having problem with high pings. Windows 7 with on-board realtek NIC. Fresh install, fully updated, drivers installed from included CD. When I start pinging router (direct 1Gb ethernet connection, 1 hop), pings start at <1ms (which is fine) and after a while they jump to 300-1000ms. I loaded up live ubuntu to test if the problem might be in HW. It's not, in ubuntu pings were always <1ms. I also noticed that when I start using connection somehow, pings go down to 1ms, but go back up when I stop using it (tested by accessing live camera feed on LAN). Power Options set to max performance. I disabled Interrupt Moderation on the NIC, didn't help. I tested it in the safe mode with networking, same problem there. It slows down our client-server based programs and I have no idea what's causing it. All I could google up was that disabling Interrupt Moderation would help, it didn't though. Anyone had similar problems? tl;nr: Computer is giving high pings to router when idle and normal pings when network is under load, it slows down our software significantly.

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• Road Warrior VPN Setup

  - by wobblycogs

  I apologise up front for the rather open ended nature of this question but I've got well out of my depth and could really do with some pointers. I need to set up a road warrior VPN solution which will allow our customers to securely access a number of services we provide for them. Customer machines will be running a variety of Windows versions from XP onwards with a variety of patch levels. Typically they will connect from the clients main offices but not always. It is safe to assume that all clients will be behind NATs but we may occasionally see a connection that isn't NAT'ed. Typical connection situation is therefore: Customer Laptop -- Router (NAT) -- Internet -- VPN Server + Firewall -- Server (Win 2008 R2, Non-routable IP) There will initially be a dozen or so people that could connect but that will grow quickly to around 100. It's unlikely that we'll see that many concurrent connections though, I imagine our total VPN throughput would be <50Mbps peak. What are my options for setting this up? I've been trying to set up a system like this using a MikroTik router for a few days but have struggled to get it working correctly, particularly with NAT'ed clients. I've had a quick look at OpenVPN and liked what I saw but I think it's unlikely our customers IT departments would allow the client to be installed. Finally I've looked at the Cisco ASA range but I'm on a fairly tight budget so this is less preferable but it looks like it would work pretty much out of the box. My fall back position is to connect the server directly and use the provided VPN + Firewall facilities but that is far from ideal as the number of servers is likely to grow over time.

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• wireless repeater vs wireless bridge?

  - by Kossel

  Scenario: I have a ADSL modem inside the studio which is connected with some wired/wireless devices. but when I'm in the backyard with my laptop the wireless signal is very poor, so the connection is very unstable. I have an old belkin wireless router and I read that it can be useful in this scenario. after some search, it's compatible with DD-WRT, and seems setting it both wireless repeater or wireless bridge can do the job. but which is better for speed and stability or for my purpose they are the same? wireless repeater wireless bridge

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• can't get to admin page after factory reset netgear wg602

  - by stefanB

  I have wireless Netgear wg602 on my home network (connected to my internet modem/router). I've had it secured and locked down to only accept connection from specific MAC addresses. I've forgotten the password that I used but my Mac Book laptops can still connect (multiple OS updates - it can't retrieve and display the password but it can use it to log in to WPA) so I want to reconfigure it from scratch (have some new devices). I tried to reset the Netgear wg602 to factory settings (pressed reset button for 10 sec), reset my laptop IP address to local address suggested in manual (192.168.0.210 net mask 255.255.255.0), connect Netgear via ethernet cable to my mac book pro but I can't get to the admin page at 192.168.0.227 as suggested by manual (firefox or safari). At this stage the Netgear is not connected to router, it is only connected to mac book. I can't ping the wireless access point either (but it is on all lights are on). What am I doing incorrectly? Last time I configured it via Windows now I only have Mac Book (which I've used with the wireless access point for 2 years so no compatibility problems).

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• 802.11g -> wired ethernet bridging not working

  - by Malachi

  Usually people want to go the other direction, but I want to take our relatively fast and stable house 802.11g signal and bridge it to ethernet. I have tried using an Airport Express (the b/g flavor) and my i7 MacBook pro, both to no avail. Word is that the b/g flavor of This flavor of Airport Express maxes at firmware 6.3 which doesn't support this kind of bridging properly. However, I expected my MacBook pro to do the job with its "Internet Sharing" feature. Alas, although my wired PC does sort of see it, it doesn't work out. Strangely, using DHCP the PC receives the same IP address as my MBP uses on the network. Less strangely, but still surprisingly, the wired ethernet port on my mac registers as the IP address of the gateway when queried with IFCONFIG. It sort of makes sense that the mac would "pretend" to be the gateway, but the whole thing just isn't working and seems configured wrong - but all the docs I see say basically "OS X Internet Sharing: click it and go". What do I do? Do i really have to buy more hardware, even though I have plenty of would-be candidates for bridging? Incidentally, the host router originating the 802.11g signal is a belkin 802.11g router, and is documented to support WDS.

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• using gmail as email relay for sendmail

  - by Nikita

  I used to be able to send emails using a gmail account & sendmail configured using one of the guides on the Internet, for example: http://appgirl.net/blog/configuring-sendmail-to-relay-through-gmail-smtp/ This is a small server and I've recently moved it to a different house. And sendmail has stop working. The only thing different in the network setup is a new router. What is happening: In the log files, I see the following error: ...stat=Deferred: smtp.gmail.com: No route to host When I run from the command line: strace sendmail -f A -t B -u "Subject" -m "Message" -tls=yes ssl=yes -s smtp.gmail.com:587 -xu A -xp XYZ It hangs on this call: recvfrom(3, "m0\201\203\0\1\0\0\0\0\0\0\4ares\3lan\0\0\34\0\1", 8192, 0, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("192.168.1.254")}, [16]) = 26 close(3) = 0 time(NULL) = 1339997943 open("/etc/localtime", O_RDONLY) = 3 fstat64(3, {st_mode=S_IFREG|0644, st_size=3477, ...}) = 0 fstat64(3, {st_mode=S_IFREG|0644, st_size=3477, ...}) = 0 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb76ff000 read(3, "TZif2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\4\0\0\0\4\0\0\0\0"..., 4096) = 3477 _llseek(3, -24, [3453], SEEK_CUR) = 0 read(3, "\nEST5EDT,M3.2.0,M11.1.0\n", 4096) = 24 close(3) = 0 munmap(0xb76ff000, 4096) = 0 socket(PF_FILE, SOCK_DGRAM|SOCK_CLOEXEC, 0) = 3 connect(3, {sa_family=AF_FILE, path="/dev/log"}, 110) = 0 send(3, "<18>Jun 18 01:39:03 sendmail[268"..., 96, MSG_NOSIGNAL) = 96 nanosleep({60, 0}, So it looks like at some point it tries to resolve the DNS name, but I don't have anything running on 53, so it dies out and then just hangs. The other interesting thing is that msmtp works just fine on the same server. Update: ares in strace output is actually the name of my server, but .254 IP address is the address of the router. Could anyone tell me why this is happening or what further steps can I take to investigate the issue? Thanks!

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• Routing Traffic on Ubuntu to give Raspberry PI Internet Access

  - by Scruffers

  I'm hoping someone can point me in the right direction for setting up my Linux (Ubuntu 12.04) box to route traffic from eth0 to wlan0. I'll try and explain the problem I am trying to solve: I currently have two separate networks: [RaspberryPi/eth0] 192.168.2.2 / 255.255.255.0 ^ | v [Ubuntu/eth0] 192.168.2.1 / 255.255.255.0 And: [Ubuntu/wlan0] 192.168.1.100 / 255.255.255.0 ^ | v [ADSL router] 192.168.1.1 / 255.255.255.0 So currently if I want to access the RaspberryPI I can SSH from the Ubuntu box to the PI. And if I want to use the Internet, I have full access from the Ubuntu box, but nothing from the RaspberryPI - the two networks are partitioned. What I would like to do is configure things so that the RaspberryPI has Internet access via the Ubuntu box and out to the Internet. I tried to create a bridge, but got the message "wlan0: operation not supported" (wireless chipset is Ralink RT3062). I'm sure giving the Raspberry PI Internet access should be easy to do in this configuration, but I am a bit lost - can someone point me in the right direction please?

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• Instructions to setup primary and only domain controller

  - by Robert Koritnik

  Where could I get best step by step instructions (with some simple explanations) how to setup domain controller on Windows Server 2008 R2 Server Core? I don't know what do I need? Do I need DNS as well and AD and so on and so forth. I don't know enough about these things, but I need to set them up to prepare development environment. I would also like to know how to configure firewall on DC machine, to make it visible on other machines because I've setup DC somehow but I can't connect to it... This is my HW config: Linksys internet router with DHCP my dev machine is Windows 7 my DC machine is a VM in my dev machine my dev machine has a hw network adapter to linksys and a virtual network adapter to DC DC machine has two network adapters: one to linksys (to be internet connected so it can be updated etc.) and one to host (my dev Win7 machine) Edit My development machine should access domain controller and logon using domain credentials. Development machine would access internet directly via Linksys router. My domain controller machine would only serve authentication (and if I'm able to configure it right) should also have Active Directory Federation Services in a workable condition. I hope this is a bit more clear now. At least a small bit.

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• Set up Linux box as WAP for MyBookLive?

  - by AcidFlask

  I inherited an old Linux box as well as a MyBookLive and would like to make the MyBookLive available over my wireless, essentially using the Linux box as a wireless access point. I just wiped the Linux box (home) and installed Ubuntu 12.04 on it. My network setup currently looks like this: (192.168.0.1 netmask 255.255.255.0) ISP --- wireless router --- wlan0 on home (192.168.0.12) | eth0 on home --- MyBookLive MacBook (192.168.0.11) so that the MyBookLive is basically a glorified external hard drive. The router does have an Ethernet port, but it is being used by my roommate's computer so I can't plug the MyBookLive directly into it. Right now I can ping MyBookLive.local and MacBook.local from home, but I am having trouble understanding and figuring out what the correct iptables commands are to make my MacBook see my MyBookLive through the Bonjour network. Also, I'm not sure if I need to set up DNS to forward xxx.local Bonjour/Zeroconf addresses. I tried the following to forward my entire wired network (which has only my MyBookLive) to a single IP address: sysctl net.ipv4.ip_forward=1 iptables -A FORWARD -i wlan0 -o eth0 -j ACCEPT iptables -A FORWARD -i eth0 -o wlan0 -j ACCEPT iptables -t nat -A PREROUTING -i eth0 -p tcp -j DNAT --to 192.168.0.66 iptables -t nat -A PREROUTING -i eth0 -p udp -j DNAT --to 192.168.0.66 but I can't ping this address from my MacBook. This is probably horribly wrong, but I am a complete noob at setting up this kind of network and could use some expert help with setting this up properly.

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• How to stop NAT dropping idle connections?

  - by WGH

  I have a TCP connection that can be idle for many hours. The traffic is flowing from the server to the client only. One might say it's kind of push notification. My home router, however, tends to drop the connection silently after 20 minutes (the value of /proc/sys/net/netfilter/nf_conntrack_tcp_timeout_established). The server detects the loss once it tries to send anything (I assume it receives RST from the router itself). As client never sends anything, it never detects the loss. RFC 5382 "NAT Behavioral Requirements for TCP" states the following: A NAT can check if an endpoint for a session has crashed by sending a TCP keep-alive packet and receiving a TCP RST packet in response. It makes sense. It's much more effective than sending keep-alives by the host itself (as only NAT knows its own timeout). And probably not hard to implement. Is there any NAT solutions implementing this? It would be great if there was a way to enable this in iptables.

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• Why do I need a managed switch and which one should I buy?

  - by ascanio1

  I bought a 2nd router and I want both routers to have direct WAN access to the modem. One of the 2 routers directs VOIP traffic to a telephone line port. This VOIP service is provided by the cable carrier which also leases the modem & the router. The cable company technician told me that this VOIP line uses IPv6 addressing and therefore I must employ an IPv6 capable/compliant Giga Hub/Switch or my telephone line won't work anymore. Pls advise me (brand/model) an IPv6 compliant, 2 port, switch to purchase. Pls educate me: By reading this forum I thought that hubs broadcast traffic to all ports, regardless of which input/output is being used and so, theoretically, they have nothing to do with IP. Correct? Same story for unmanaged switches, where the only difference is that these latter devices route traffic only to those ports which are detected to be in use. Correct? I also understood that unmanaged switches route traffic simply by detecting hardware use and not by selecting specific IP traffic. Correct? Finally, there are managed switches which DO select traffic based on IP and, therefore, only these managed switches are involved with IPv6... Why would my cable company explicitly tell me, over and over, that I must use an IPv6 compliant switch? Why would they need a managed switch instead of an unmanaged one? Thanks in advance for helping me understand!

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• Choosing a home network layout

  - by James M.

  I have a server, 4 PC's, a network printer, a switch and an ADSL modem. Currently the server runs Red Hat 9 and sits between the internet and the other PCs like in http://upload.wikimedia.org/wikipedia/en/1/12/Sample-network-diagram.png I have bought a new server PC to replace the old one, and I plan to install Fedora Core linux on it. The server acts as web and file server. The PCs all run Windows. Alternatively, I could connect the new server and all PCs to the switch, and connect the switch to the modem. (Sorry, couldn't find an image.) What are the pros and cons of these network layouts? Eg. in terms of reliability, security and flexibility? I am not a Linux guru but know of (and am not afraid of) iptables, dhcpd et al. Thank you for any tips, pointers and links.

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• Setup windows 2012 AD in Hyper-V for a Test environment

  - by hub

  Im trying to setup a Windos 2012 R2 test environment on my work computer (a laptop). I have a AD, DHCP and DNS server on server A, and a client connecting to the doman and that works. The client can ping the AD server and gets a valid IP adress. If I ping google.com from the client I get the IP adress but I dont get any responses (request time out). If i ping google.com from server A it works as it should. Server A have a connection to the Internet through a "external network switch" in hyper-v, which gets its internet from a router and the client is connected to a "internal network switch". May the poblem be that server A is behind a router? Can I make this solution to work regadless the network my laptop is connected to? At home i have one IP adress, at work its a totally different range. What I would like is to use my laptops internet connection, regardless wifi or wired, to act as incomming internet, is this possible?

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• How to create a static IP on Windows Server 2008 R2 so I can access the server remotely

  - by Aesir

  I have just purchased a HP Proliant N40L which I am intending to use as a NAS, learning tool and just in general something to mess around with. As a student via the Microsoft dreamspark program I can get a free copy of Windows Server 2008 R2 which I am using as the OS. So that I can remote to the box from outside of my local network and so that I can stream media from it to my PS3, I have read that I need to create a static IP for the server and use port forwarding to forward to this IP so I can remote in. Is this correct? I am not really sure how to do this and if I need to make these changes on my router configuration, on the OS or both. I am a novice when it comes to networking however most resources for Windows server 2008 R2 seem to assume a fair amount of experience already. I realise that using this particular OS may seem like overkill for what I currently wish to do with it (stream content to other devices and backup) but as I can get a copy for free it seems sensible. Edit: From reading answers posted I feel I should give more information. I have now tried to add a static IP address using my router configuration settings. I have used the getmac command to get the mac address of the server. My ISP is Virgin Media and I have gone to the LAN IP section and I have added an IP address to the DHCP Reservation Lease Info. I can now use remote desktop connection internally to remote to the server (so I am assuming assigning this IP has worked). How do I configure this on the OS as well? I am also unsure on how I would remote to this machine outside of my local network?

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• How can I setup OpenVPN with IPv4 and IPv6 using a tap device?

  - by Lekensteyn

  I've managed to setup OpenVPN for full IPv4 connectivity using tap0. Now I want to do the same for IPv6. Addresses and network setup (note that my real prefix is replaced by 2001:db8): 2001:db8::100:0:0/96 my assigned IPv6 range 2001:db8::100:abc:0/112 OpenVPN IPv6 range 2001:db8::100:abc:1 tap0 (on server) (set as gateway on client) 2001:db8::100:abc:2 tap0 (on client) 2001:db8::1:2:3:4 gateway for server Home laptop (tap0: 2001:db8::100:abc:2/112 gateway 2001:db8::100:abc:1/112) | | | (running Kubuntu 10.10; OpenVPN 2.1.0-3ubuntu1) | wifi | | router | | OpenVPN INTERNET | eth0 | /tap0 VPS (eth0:2001:db8::1:2:3:4/64 gateway 2001:db8::1) (tap0: 2001:db8::100:abc:1/112) (running Debian 6; OpenVPN 2.1.3-2) The server has both native IPv4 and IPv6 connectivity, the client has only IPv4. I can ping6 to and from my server over OpenVPN, but not to other machines (for example, ipv6.google.com). net.ipv6.conf.all.forwarding is set to 1, I've tried disabling net.ipv6.conf.all.accept_ra as well, without luck. Using tcpdump on both the server and client, I can see that packets are actually transferred over tap0 to eth0. The router (2001:db8::1) send a neighbor solicitation for the client (2001:db8::100:abc:2) to eth0 after it receives the ICMP6 echo-request. The server does not respond to that solicitation, which causes the ICMP6 echo-request not be routed to the destination. How can I make this IPv6 connection work?

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