Hi again, Henrique. On 24/01/17 13:37, Henrique de Moraes Holschuh wrote: >> It's very weird. The cablemodem does not lose Upstream and Downstream >> synchronization, but nevertheless I see that the established >> connections are lost (for example, instant messaging, SSH, or HTTP, >> to mention a few). > Are you under any sort of stateful packet filtering device (L3+ > firewall, NAT/CGNAT gateway, anti-virus device)? Inquire your ISP. > > Such devices can _and do_ cause this sort of issue when they hit > resource limits of any sort (such as going over peak capacity of > connection setup/teardown rate, throughput, etc), or during failover, > etc. > > It could also be caused by link or routing problems in the ISP > backbone, backhaul, and even in the Internet border itself (ISP to > ISP eBGP links). > > (...) I thought about doing a test with MTR. Maybe it could provide some interesting information. This way I left in a later window an ssh connection to a server running htop, and a window ahead running MTR. When the window with htop freezes, MTR shows as a cascade failure from the cablemodem, turning red the hosts from this (192.168.1.1). This stays red for about three or four seconds and then goes back to black. https://ibin.co/3AMfJ9PYCGJ4.png When any router turns red means 100% packet loss? Because in the screenshot this value was not in 100 for the cablemodem on that moment. What do you think? Will it be a problem with the cablemodem? Kind regards, Daniel
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