Very strange networking problem. Seems VERY hard to solve

I have posted this in the CCNA section but there are not many solutions left. I'm posting it here in case some people of higher skill don't visit the CCNA section and I am very desperate to get this fixed. I will copy and paste what I wrote on another forum as it rules out everything I tried to this day.

Hello,

I have been trying to figure this problem out now for weeks. This is a very strange problem and hopefully someone out there has had this problem or knows how to fix it.

The issue is that when I download on my desktop PC my downloads go incredibly slow. It seems like it connects to download whatever file it may be but after the initial connection it stops and can't download anymore. It always hang usually after 0.1Kbs.

This desktop PC is upstairs using Wifi. I also have a desktop downstairs plugged directly into my ISP modem/router and a laptop that uses the same Wifi my desktop upstairs does and downloads files great. So this issue seems very strange to me!! I will tell you the things I have done to rule out lots of options.

Updated drivers
Switched wifi channels
Speedtest.net shows 143Mbps DL / 10Mbps UL
Ipconfig /release & /renew
Netsh winsock reset
Ipconfig /flushdns
Plugged directly into the modem/router
Called my ISP to change the modem/router 2 times
Ran malware & ccleaner
Reset the router/modem
Statically assigned a DNS 8.8.8.8
Pinged my router 4ms/8ms/4ms/7ms
Pinged google.com 48ms/47ms/47ms/46ms
Reformatted and installed windows 7 TWICE!

*Now here is where things get weird!!* If I go through a proxy like hide.me etc and lets say I go to steam to download the client, the download is great. Now someone mentioned a malware proxy? But if i wiped my computer and did a fresh install of windows 7 shouldn't this have taken care of the problem? And if this was true also wouldn't my desktop that is plugged directly into the modem/router be affected by this? Same with my laptop?

I was starting to think maybe a faulty MOBO but why would files download great through a proxy if this was the issue?

It seems like this is crazy and there is no solution and nothing makes since why this is happening only to 1 computer.

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Comments

TechnicalJay

How would I make the images readable?

shortstop20

TechnicalJay wrote: »

In the very last picture it says Who has 192.168.0.1? Tell 192.168.0.6. I'm .3 on my network. Could this be the issue?

Also I don't have the option to change the MAC to my laptops MAC? I believe I'm in the right spot.

That is what's known as an ARP request/reply and it is perfectly normal on a network.

Hondabuff

If other computers download fine on your network and its isolated to just the Asus MB I would just open up a RMA with Asus. Your just chasing ghosts at this point.

negru_tudor

Odd thing is that he can download fine through a VPN client..

Hondabuff

I would be curious to see if you put the modem into "transparent bridge mode" and connected a small router behind it with just NAT enabled. A lot of ISPs are cracking down on Bittorrent's and maybe the modem is throttling on that Mac address. Just a theory. Might be worth buying a Intel PCI-E nic card and tossing it in. He is in so deep now that he almost has to fix it or die trying, lol

negru_tudor

Agreed. I've seen this once where a guy I knew in college got one of his MAC addresses banned by the ISP for some stupid things he did. Needless to say, changing the MAC on the NIC allowed him to work around that ban. Can't say I've ever encountered this sort of action from an ISP in any other occasion though.

The "transparent" mode might help alleviate this issue but the problem with this approach is that some of these modems have modified firmware and ISPs intentionally remove this feature as they don't officially support this sort of deployment. Even if you flip the modem into "transparent" mode there's still some toying around with the NAT router to get PPPoE configured right...a lot of variables to juggle with.

@TechnicalJay: try this MAC Address in Windows: Change, Lookup, Spoofing

d4nz1g

post the .pcap instead of images

MAC_Addy

negru_tudor wrote: »

Agreed. I've seen this once where a guy I knew in college got one of his MAC addresses banned by the ISP for some stupid things he did. Needless to say, changing the MAC on the NIC allowed him to work around that ban.

Does the MAC address leave the internal network? Unless the ISP is controlling the modem/router.

shortstop20

MAC_Addy wrote: »

Does the MAC address leave the internal network? Unless the ISP is controlling the modem/router.

The ISP would never see the MAC address of the client unless it was plugged directly into the ISP modem.

Of course, it's quite possible they just banned the MAC address of his router and he changed the MAC to get back on. Regardless, MAC addresses are local to the subnet, they don't cross a L3 boundary.

TechnicalJay

negru_tudor wrote: »

Agreed. I've seen this once where a guy I knew in college got one of his MAC addresses banned by the ISP for some stupid things he did. Needless to say, changing the MAC on the NIC allowed him to work around that ban. Can't say I've ever encountered this sort of action from an ISP in any other occasion though.

The "transparent" mode might help alleviate this issue but the problem with this approach is that some of these modems have modified firmware and ISPs intentionally remove this feature as they don't officially support this sort of deployment. Even if you flip the modem into "transparent" mode there's still some toying around with the NAT router to get PPPoE configured right...a lot of variables to juggle with.

@TechnicalJay: try this MAC Address in Windows: Change, Lookup, Spoofing

Thanks I'll try this when I get home

What will be interesting is that I'm moving Feb 3 and getting will be getting a new connection so if I can't get this fixed by then we'll see if it really is my computer or something to do with the connection at my current place. If it's the same problem at the new place I'll buy another MOBO and report the results

negru_tudor

@MAC_Addy: his PC was plugged straight into the ISP router which they had full control of. He would use a dial-up network connection on his desktop to authenticate his machine with the carrier. Happened a couple of years ago (around 8 or 9).

Not sure how the OPs modem/router operates. Guess the .pcap would be best or at least some readable screenshots.

@TechnicalJay: if you plug a crossover cable between your laptop and this PC, can you confirm you're able to move files from the PC to the laptop? Guess since the VPN client worked for you this should as well..

daveyb

Did you try dropping your MTU like I suggested?