weird network problem - Page 1
Forum section: electronics / general

author: hamdi.tn
author_rank: Frequent Contributor
timestamp: October 07, 2017, 10:01:20 am
content: Hi everyone,Am facing a strange problem with my office network, and i can't find any solution for it and it been going for 2 month now.Situation is, i have 3 laptop in my office connecting by wifi through an access point linked to WLAN. This WLAN is just a fibre shared connection with some other offices, this building is a Tech-parc.Internet -> WLAN -> My Ap creating a subnetwork -> 3 PCSo the strang thing is, when my main pc connect, we lose connection in the AP and the remaining 2 pc, basically the WLAN stop being accessible until i change the IP adresse of the AP. This only happen when i connect my laptop, if not everything work fine.The only way i can keep internet running is by using hotspot.I asked the network admin if my machine was banned from the network for some raison, no it's not the case.So am a been lost of what can be the reasons behind this.I use Kaspersky Internet security, scanned the damn thing multiple times. Installed a fresh version of windows.Tried to connect through Ethernet or different Wifi interface other the built it one. changed the MAC of the built-in wifi. if by any chance am getting disconnected by the network.Nothing help , i keep losing internet in a few seconds.so amanyone seen this before or have a idea of any other test i can do.Thanks.

author: Halcyon
author_rank: Unknown
timestamp: October 07, 2017, 10:25:28 am
content: There are so many variables at play here.Let me get this right, you have a wireless link between two locations, but then you are also connecting to another Wi-Fi network on your end?

author: Towger
author_rank: Super Contributor
timestamp: October 07, 2017, 10:45:18 am
content: Quote from: Halcyon on October 07, 2017, 10:25:28 amAssuming the basics. ..An AP is my mind does not have a DHCP server and does not do NAT. So one PC gets the one address from the office WAN and no other PCs can access or have strange problems on the network.

author: hamdi.tn
author_rank: Frequent Contributor
timestamp: October 07, 2017, 10:51:41 am
content: Hi,No, the only wireless network is my subnetwork created with my ap. WLAN is wired network running through the whole building. But no one is having a problem except me with my main pc. what make it more confusing is i this machine is not causing any problem anywhere else.if fact my ap is capable to switch to 4G when equipped with sim card, we have no problem there.WLAN -> AP -> With my pc connected => NOKWLAN -> AP -> Without my pc connected => OK4G/3G -> AP -> With/Without my pc => OK

author: hamdi.tn
author_rank: Frequent Contributor
timestamp: October 07, 2017, 10:56:46 am
content: Quote from: Towger on October 07, 2017, 10:45:18 amam maybe calling it wrongly AP, it's a router that take a single fixed ip adress from WLAN (assigned by Network admin) and run a dhcp server for units connected to it. if fact when i lose connecting and i change that adress everything run again for a few second, then cutoff again.

author: Towger
author_rank: Super Contributor
timestamp: October 07, 2017, 11:02:53 am
content: Check all the Network settings on your PC are Automatic and there is no fixed IP or gateway.That is the make and model of AP.

author: Halcyon
author_rank: Unknown
timestamp: October 07, 2017, 11:04:10 am
content: WLAN = Wireless LAN, not wired.It sounds like an IP address conflict. Is your PC set to static IP or DHCP? If it's set to static, change it to automatically obtain an IP address.

author: hamdi.tn
author_rank: Frequent Contributor
timestamp: October 07, 2017, 11:09:26 am
content: Quote from: Halcyon on October 07, 2017, 11:04:10 amyeah you right, I mean Wide LAN.PC DHCP already.

author: CJay
author_rank: Super Contributor
timestamp: October 07, 2017, 11:51:45 am
content: Quote from: hamdi.tn on October 07, 2017, 11:09:26 amStill check the settings, there are more than just the ones on the 'front page', some idea of the subnet being used etc would be useful.Has the PC ever been told to share its internet connection perhaps?

author: Benta
author_rank: Super Contributor
timestamp: October 07, 2017, 11:53:54 am
content: I guess you mean WAN, not WLAN.

author: IanMacdonald
author_rank: Frequent Contributor
timestamp: October 07, 2017, 12:15:10 pm
content: Run arp -a on each computer after attempting a connection. This will tell you which IP itthinksshould pair up with each MAC address.The AP and default gateway are the important ones.I assume you know that ipconfig /all will give you the IP, gateway, etc.

author: Brumby
author_rank: Unknown
timestamp: October 07, 2017, 12:22:42 pm
content: Quote from: Halcyon on October 07, 2017, 11:04:10 amThat was my very first thought - but I've not played around with Access Points or anything other than basic networks, so I was just going to see how this panned out.

author: hamdi.tn
author_rank: Frequent Contributor
timestamp: October 07, 2017, 12:46:17 pm
content: I changed this router and installed an AP and now am getting IPs directly from WAN for every PC. No problem so far. am not sure if it's safe. but will keep it for few days and see.Thanks everyone.

author: Old Don
author_rank: Regular Contributor
timestamp: October 09, 2017, 01:04:16 pm
content: Sounds like the first local router wasn't passing the DHCP requests on to the main wan router/server and also wasn't set up to assign local sub-net DHCP addresses.

author: hamdi.tn
author_rank: Frequent Contributor
timestamp: October 09, 2017, 03:42:20 pm
content: Quote from: Old Don on October 09, 2017, 01:04:16 pmit was ... we get local IP no problem, it work as it suppose to work.I give it to the office next to me so they can try it on their network. no problem. they are happy with it , they are not welling to give it backthey have a local backup machine , those network hard-drive kind of thing, that was accessible through WAN since they use to connect directly to it. now they use a sub-net and their data are "more" safe.for me the new thing work well for me, no problem so far.