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• Routing connections to passthrough a local machine

  - by xiamx

  Please tell me if what I'm trying to do is feasible. I have a router named "R" which is connected to WAN. R allows adding rules to the routing table. There are numerous of machines connected to the LAN port of R, they all have ip addresses 192.168.1.* assigned with DHCP on R. Among those machines, there's a machine C with ip address 192.168.1.100. I want all traffic of other machines in the subnet to pass-through machine C where some filtering and logging will be done. Is this possible? Is there a name for what I'm trying to do? (so i can do more googling later)

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• New Secure Website with Apache Reverse Proxy

  - by jtnire

  I wish to set up a new website that will be accessed by users using HTTPS. I think it is good practise to put the "real" web server in a seperate subnet, and then install an Apache Reverse Proxy in a DMZ. My question is, where should I put the SSL cert(s)? Should I a) Use a self-signed cert on the "real" web server, and a proper cert on the reverse proxy? b) Use 2 real certs on both the "real" web server and the reverse proxy? c) Don't use any cert on the "real" web server, and use a proper cert on the reverse proxy? I'd like to use a) or c), if possible. I also don't want anyone's browser complaining of a self-signed cert. Thanks

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• 'IPv6' Newbie with IPv6 address assigment

  - by Cute Puppy

  I am new to IP v6 and I am looking to translate some existing private IPv4 addresses into v6 address assignment. Can someone please help me to answer/explain the questions below? If I have an v4 address of: 10.10.0.0/22 10.10.1.0/22 10.10.2.0/22 10.10.3.0/22 10.10.8.0/20 10.20.1.0/24 What will the new v6 address to be? I have been looking online @ http://www.subnetonline.com/pages/subnet-calculators/ipv4-to-ipv6-converter.php or other sites, Seems like they translated it directly to be: fe80::a0a:0 /118 fe80::a0a:100 /118 fe80::a0a:200 /118 fe80::a0a:300 /118 fe80::a0a:800 /118 fe80::a14:100 /120 Can someone please explain to me how we get to /118 from either "/22 or /24" (1. and 5) In addition, I would like to create the new private address based on the Unique local address "fc00::/16" How do I expand from there? Any help is greatly appreciated it!! Thanks,

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• Choosing a monitoring system for a dynamically scaling environment: Nagios v. Zabbix

  - by wickett

  When operating in the cloud and scaling boxes automatically, there are certain monitoring issues that one experiences. Sometimes we might be monitoring 10 boxes and sometimes 100. The machines will scale up and down based on a demand. Right now, I think the best solution to this is to choose a monitoring solution that will instantiation of targets via calls to an API. But, is this really the best? I like the idea of dynamic discovery, but that is also a problem in the cloud seeing that the targets are not all in the same subnet. What monitoring solutions allow for a scaling environment like this? Zabbix currently has a draft API but I have been unable to fund a similar API for Nagios. Is there a similar API for Nagios? Anyone have any alternate suggestions besides Nagios and Zabbix?

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• Multiple subnets behind SonicWall TZ 180

  - by Derek

  We have a SonicWall TZ180 that acts as a VPN endpoint. Right now it has one WAN IP address and a /24 assigned to the LAN interface. Our mail cluster administrator asked if it was possible to add a second private class C behind the VPN. This second subnet would be available to the other network and then we would use address objects and acls to limit access. Is this possible? I read up on PortShield but I don't know if that's what we would need to use because we're pushing all data out of one physical port into a Cisco switch that has VLANs already set up. Addendum: It appears that PortShields will do what I want with only one limitation; it requires a direct 1-1 relationship of portshield to physical port. This would then limit us to 4 PortShields on 1 TZ180. Is there a better solution than this?

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• Can I use dis-similar HW for Win2008r2 DFS-R

  - by cwheeler33

  The setup: Windows 2008R2 Ent on two machines. The roles on each server will include File Servers and DC's. The machines come from two different vendors (Dell/HP) The Dell is an Athlon and the HP is an Intel. Both have roughly the same speed CPU and 8GB of RAM. They have different Raid controllers, and more or less the same amount of disk space (roughly 6TB.) Can the servers use different types of hardware? Is there any documentation about this? The last question I have is about the network. Can DFS-R be forced to use a differen subnet from the regular network?

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• IOS not saving evaluate rule in access-list

  - by DeeJay1

  Hi. I have a basic firewall set up on an pretty od IOS in form of IPv6 access list exterior-in6 evaluate exterior-reflect sequence 1 permit ipv6 any host [my external address] sequence 10 permit tcp any host [my internal address] eq 22 sequence 11 permit icmp any any sequence 800 permit udp any any range 6881 6889 sequence 900 permit tcp any any range 6881 6889 sequence 901 deny ipv6 any any sequence 1000 IPv6 access list exterior-out6 permit ipv6 [my internal subnet] any reflect exterior-reflect sequence 10 Unfortunately the evaluate exterior-reflect sequence 1 line seems to get lost after each reboot, leaving my internal network without access. Any ideas?

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• how do I create a bidirectional bridge using iptables

  - by Kolzoi

  Setup: I have a samsung LCD TV that is connected via eth0 to a T41 Thinkpad running Ubuntu 10.10 which is wirelessly connected to the home router. I am trying to get Samsung's remote control app working on my iPad but the app won't allow me to put in an ip address and only discovers the tv if it's on the same subnet as the iPad (lame). So I need the laptop to route packets from eth0 to the wireless interface (wlan0), and I need about 3 ports on the wlan0 interface to be forwarded to the samsung tv. Hopefully all this makes sense. I've been messing around with iptables and samsung is now able to access internet via laptop wireless, but mapping from wlan0 back to the samsung tv is eluding me.

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• Automated VLAN creation with residential Wireless devices

  - by Zephyr Pellerin

  We've got a few WRT devices from Linksys here, and the issue has arisen to deploy them in a relatively small environment, However, in the interest of manageability we'd like to be able to automatically VLAN (ideally NOT subnet) every user from one another. It seems obvious to me that the default firmware isn't capable of this - can OpenWRT/Tomato/DD-WRT support any sort of functionality such that new users are automatically VLANed or otherwise logically separated from other users? It seems like there's an easy IPtables or PF solution here, but I've been wrong before. (If that seemed a little ambiguous, heres an example) User 1 sends DHCP request to server, new VLAN (We'll call VLAN 1) is created, user is placed in that VLAN. Then, user 2 sends a DHCP request and is placed in VLAN 2 etc. etc.

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• Sharing a printer on Windows home network

  - by Jeff

  I have a home network, and I'm trying to share a printer connected to one of the PCs. The wireless modem through which the internet comes through doesn't reach the entire house, so we have another router set up as well. The modem is 192.168.1.1 (let's call this A) and the router is set up as 192.168.1.100 (let's call this B). Subnet masks 255.255.255.0. The printer is hooked up to a PC on B. If my laptop is connected wirelessly to B, it can see the printer. However, if it's connected to A, it doesn't show up in My Network Places. How can I get it so that I can print to the printer regardless of whether the

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• Sharing a printer on Windows home network

  - by Jeff

  I have a home network, and I'm trying to share a printer connected to one of the PCs. The wireless modem through which the internet comes through doesn't reach the entire house, so we have another router set up as well. The modem is 192.168.1.1 (let's call this A) and the router is set up as 192.168.1.100 (let's call this B). Subnet masks 255.255.255.0. The printer is hooked up to a PC on B. If my laptop is connected wirelessly to B, it can see the printer. However, if it's connected to A, it doesn't show up in My Network Places. How can I get it so that I can print to the printer regardless of whether the

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• Use LAN to interface Synergy while having WiFi connected to internet

  - by freonix

  Similar question and solution I have LAN and WiFi connection, with the WiFi connected to internet and the LAN is simply connected via an Ethernet cable between two computers. I need to get Synergy working without compromising the WiFi internet. I've tried the solution above but couldn't seem to work. Both of the computer are running Windows XP. Even setting the LAN IP to static and under the same subnet doesn't seem to work. Anyone with similar situation and got Synergy to work? edit : Refined the question for clarity. Also, the computer are able to ping each other. Remote desktop can be accessed as well. I suspect the problem lies in Synergy's configuration.

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• RV042 - how to broadcast UDP through VPN

  - by user47221

  I setup a gateway to gateway vpn connection with linksys RV042 router. i was able to ping each other, access file sharing ( with netbios enabled ). They are having same subnet mask 255.255.255.0, 192.168.1.0 <--- 192.168.2.0 Firewall disabled. But when i created/host LAN games (eg. warcraft3), it cannot be detect by clients at another site/LAN. As i know warcraft3 is using UDP broadcast to tell the client the game is creaetd. 1. How to broadcast UDP to another LAN ? any things to do with multicast ?

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• How to set up VLAN network

  - by Paddington

  I'm changing my network from having every device on flat network to using VLans. My problem is that we already have a lot of devices on this network(192.168.20.0/24). From theory, I read that each Vlan has to be a different subnet and then I need to configure virtual interfaces on my Cisco router to cater for inter vlan routing. 1) How can I segment this network with minimum down time on the devices already on the network? 2) Can I just create Vlans and leave all these Vlans in the same layer 3 network so that they can go out of the network (I am not too concerned about inter-Vlan routing) or I have to create subnets which means reconfiguring the existing devices (something I do not want).

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• AD password not synchronising properly

  - by Kaczmar

  I have 600+ users in AD, but only one causes me trouble. The problem is I can reset his password from AD, he can then log in to his machine. After that he would like to change his password from Windows 7, and proceeds without errors. Logs out or locks the workstation but cannot access it again using either old or new password. So I have to reset it again and he can only use the one I provide for him. All our machines are in the same physical location in the same subnet. Functional level is 2003. I'm totally out of ideas. I could create him new user account, but I'd possibly like to know what causes this. I can only suspect some sort of synchronisation problems but other accounts work fine, and I don't know how to dig deeper into this. Thanks, Piotr

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• Can ping cannot be pinged

  - by slayerIQ

  Today, I installed my new router so I can connect my other pc and my ps3. In my network, there are some other computers these are connected with each other through another router. So I have one modem with 2 routers that make up my network. Everything works fine the only problem I am having is being pinged by other computers in the network. All the computers are on the same subnet 255.255.255.0. There is no problem with my firewall or anything I tested everything. How can i solve this?

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• D-Link router WiFi and LAN segment

  - by StreetStrider

  I have D-Link 2650 router. Some wireless and wired clients connected to it. The problem is there is no interconnection between wireless and wired devices. For instance, when I start webserver on PC connected to wired LAN, WiFi devices cannot access it (other wired devices can). However all devices are in the same subnet: 192.168.1.x. How can I connect WiFi and LAN devices to one network? Or maybe what I should know first (any information with which I can proceed)?

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• Network Table assistance

  - by mitchnufc

  I am designing a small network and have came up with the following table I am just wondering if this seems right, would appreciate some feedback, thanks. Network/Router First IP Last IP Subnet Host Broadcast Router 1 162.10.0.1 162.10.0.7 255.255.255.248 162.10.0.0 162.10.0.8 Network 1 162.10.1.1 162.10.2.253 255.255.254.0 162.10.1.0 162.10.2.254 Network 2 162.10.0.9 162.10.0.14 255.255.255.248 162.10.0.8 162.10.0.15 Router 2 162.10.0.17 162.10.0.18 255.255.255.252 162.10.0.16 162.10.0.19 Network 3 162.10.0.21 162.10.0.146 255.255.255.128 162.10.0.20 162.10.0.147 Router one is the IP assigned by the ISP

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• arp across subnets which devices can be detected?

  - by Gobliins

  i have some devices connected in the same physical network (LAN) but in different subnets. I want to detect them all with the ARP from my computer. My Computer is also in the same physical network but on a different subnet. ! The devices have no arp protocol installed (yet). Is it possible to detect the devices (with or withour ARP installed on every device)? If the devices have a MAC-address but no IP-address, can ARP still detect the machines?

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• Migrate 3 terabytes of files to a new server windows 2003

  - by smackaysmith

  We have a new file server to handle the obscene amount of files generated by the company (PDFs, XLS, DOCs and JPGs). Files being moved to the new server total about 3tb. The problem is we can't take the company down for days to move the files. The other problem is the applications creating all these files have to reference previous files, so we can't simply point them to the new server. Also, there isn't an option to have the applications create files on the new server, but reference the old server for existing files. The servers are x64 win2003 r2. Both servers are on the same subnet. DFS doesn't work. Is there an application that can handle this amount of data to copy the files over, throttle bandwidth, and do a 'merge'? By merge I mean constantly copying over newly created files until the two servers are synched.

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• Time Capsule + Ubee Router?

  - by Charlie

  I can't for the life of me figure this out. I recently had TWC installed in my house, and wanted to disable the NAT and router functions of it. I have a Time Capsule hooked up to it from LAN1 (on the Ubee) to the WAN port on the TC. The problems started occurring here. I figured the settings would be these: Ubee Configuration mode: Bridge DHCP: Off TC IPv4: 192.168.100.2 Subnet Mask: 255.255.255.0 Router Address: 192.168.100.1 DNS Servers: 8.8.8.8, 8.8.4.4 Router Mode: DHCP and NAT But using those settings, my TC says "Double NAT", so I have to change it all around to the default settings of the Ubee using NAT. This leads me to believe bridge mode doesn't actually turn off NAT...

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• How can I redirect HTTPS(S) traffic to anothr gateway?

  - by PsyStyle

  I have a network like 192.168.0.0/15 with the default gateway set to 192.168.0.1. Al the workstations of the network use this gateway for all kind of accesses to the Internet. Now I am testing a new Internet connection with another provider and for this I am using a second gateway on the same subnet with 192.168.0.2 as IP address. I want to redirect only HTTP and HTTPS traffic to this second gateway without touching the address of the default gateway set inside every workstation. How can I accomplish this task? What I have to change inside the first's gateway firewall configuration or routes? I tried with a dnat like DNAT loc:192.168.0.1 loc:192.168.0.2 tcp 80 but nothing worked. I use Shorewall for simplicity in configuration but I can understand even theorical answers which I will try to adapt to my case

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• Hyper-V can't connect from host to guest via RDC

  - by Mark

  As the title describes I would like to connect via Remote Desktop Connection to my VM. I want to use it as a Dev-machine and therefore would like to work full screen, as far as I understand RDC is the way to go. I have created an internal network connection within Hyper-V, assigned it to my VM, set a static IP/Subnet on guest (Win7 Pro) and host(Win8.1 Enterprise). It worked good for the first couple of times but now it seems to be broken or I have to do odd enable/disable network connection "dances" to get it running. Ping also doesn't work always so it does seem as if the guest and host would be "disconnected".. Is there something I can do so that the network connection always will be established?

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• Windows/Samba connection error

  - by Gomibushi

  I have a Linux fileserver serving up /home for linux and windows users. I was able to connect from my windows client, but not from a DC. Then suddenly I could connect from the DC too. The linux servers run Centrify clients, and as such are part of the domain. All on same subnet. This is what the the log.smbd says, repeatedly: [2010/02/11 11:25:57, 0] lib/util_sock.c:read_data(534) read_data: read failure for 4 bytes to client 192.168.200.3. Error = Connection reset by peer On Windows it appeared as an "unknown error". EDIT: the error code is "0x80004005". We are developing a system depended on the samba share, and are worried this will appear again. It would be nice to pin point the root of this. Any ideas what this might be? Places to look?

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• How can I tell if a host is bridged and acting as a router

  - by makerofthings7

  I would like to scan my DMZ for hosts that are bridged between subnets and have routing enabled. Since I have everything from VMWare servers, to load balancers on the DMZ I'm unsure if every host is configured correctly. What IP, ICMP, or SNMP (etc) tricks can I use to poll the hosts and determine if the host is acting as a router? I'm assuming this test would presume I know the target IP, but in a large network with many subnets, I'd have to test many different combinations of networks and see if I get success. Here is one example (ping): For each IP in the DMZ, arp for the host MAC Send a ICMP reply message to that host directed at an online host on each subnet I think that there is a more optimal way to get the information, namely from within ICMP/IP itself, but I'm not sure what low level bits to look for. I would also be interested if it's possible to determine the "router" status without knowing the subnets that the host may be connected to. This would be useful to know when improving our security posture.

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