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  1. [ubuntu_mate] Nvidia Prime Intel mode screen tearing

    I picked up a new Dell XPS 16 7590, which comes with an Nvidia RTX 1650 card and loaded Ubuntu 18.04 LTS MATE on it. One problem I am having is in Intel mode screen tearing. There seems to be a...
  2. Re: Netflix tcp_sack vulnerability hosing things

    I am curious as to where you are finding this mess happening as one thing I am trying to determine is how widespread the problem I see really is? I have seen so many different things go wrong to...
  3. Re: Netflix tcp_sack vulnerability hosing things

    Ah yes, using a torrent client. However BitTorrent runs over UDP and so any lost packets are handled in user space. I am focused on https, which in this case is going over TCP while UDP based...
  4. Re: Netflix tcp_sack vulnerability hosing things

    No. I spent time scanning through logs captured by the daily cron job and through /var/log/messages on the receiving side, but did not see it. Is this something you think will show up on the server...
  5. Re: Netflix tcp_sack vulnerability hosing things

    I looked up the TCP window scale option. My understanding is this option allows over 64KB to be in flight with a theoretical max of 1GB in flight. By default this option is turned on, however I...
  6. Re: Netflix tcp_sack vulnerability hosing things

    While I am not in the best position to gather statistics of what all Linux distros are involved in this problem, the contacts I have are pointing to multiple CentOS 6 systems seem to be exhibiting...
  7. Re: Netflix tcp_sack vulnerability hosing things

    So the admin on the other side switched back to the unpatched kernel and the problem suddenly went away. The main noticeable thing are transfer speeds dropped back down probably because the check...
  8. Re: Netflix tcp_sack vulnerability hosing things

    I did a packet capture analysis from home (to avoid issues of doing such things on the corporate network as I do enjoy being employed and thus paid). This has lead me away from thinking it is a...
  9. Re: Netflix tcp_sack vulnerability hosing things

    There are no Cisco ASAs in the path between endpoints.

    The problem is still there with the best option to date to eliminate errors being turning off TCP_SACK, however this greatly slows things...
  10. Re: Netflix tcp_sack vulnerability hosing things

    Interesting with the Cisco ASA. This is a very common firewall and I was once very well versed with them. I have asked the other admin if he is using one of these.

    It seems everything you say...
  11. Re: Netflix tcp_sack vulnerability hosing things

    These are very good points.
    1. So it is normally not permitted to packet sniff on the corporate network, but the site I am downloading from in this case is publically accessible, so I could...
  12. Re: Netflix tcp_sack vulnerability hosing things

    Well whoever patched it seems to have neglected an edge case of packets coming in out of order with long distance transmission when patching a protocol designed to handle packets coming in out of...
  13. Re: Netflix tcp_sack vulnerability hosing things

    Disabling TCP_SACK seems to have done the trick. Thanks. Netflix has got to stop breaking this stuff. I suppose the test transfer took longer this last time around, but maybe the server is just...
  14. Netflix tcp_sack vulnerability hosing things

    I work in the NASA / JPL sphere, which is heavy on Linux and we have a problem with the latest Netflix tcp_sack patch. The specific use case is fully patched Linux Tomcat server talking to either...
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    vsync not syncing after a while

    I have tried various tricks to get vsync to work correctly on my system with a high end Nvidia card while playing Steam games, but the best I can get is it works at first, but after awhile (as in I...
  16. Re: mdadm software RAID 5 failed after power loss

    I have talked to various people since this post and what I have come across is it is not uncommon to lose a software RAID 5 array on Linux based systems and this includes NAS boxes that are Linux...
  17. mdadm software RAID 5 failed after power loss

    While getting all of my hens in a row before upgrading from 16.04 to 18.04, I decided to tidy up some cables and lightly bumped the power cord and the machine hard downed. As this whole setup has...
  18. Ubuntu firewall failover to 4G hotspot

    Something interesting I came across is at least for my wireless provider (Verizon), I can add a Jetpack AC791L for not too much extra money (and I get a very strong signal at home) while at the same...
  19. Ubuntu 16.04 LTS wide-dhcpv6 broken again

    I have noticed that wide-dhcpv6 has broken in yet another way. This time around it is assigning the routing wrong when dishing out to multiple subnets. So instead of passing the request for a /60...
  20. Toslink PCM 2 channel and AC3 5.1 [Solved]

    While getting full Toslink support to work in a satisfactory manner under Ubuntu 14.04 LTS, I came across some caveats that I did not see well documented, so I thought I should post my experiences on...
  21. [ubuntu] Re: IPv6 capable edge router/firewall Comcast Ubuntu 14.04

    I have moved and am now on the Cox network. One nice thing about being on the Cox network is the wide-dhcpv6 option of rapid-commit seems to work.
    One problem I am having is Cox stops routing to my...
  22. [ubuntu] Re: IPv6 capable edge router/firewall Comcast Ubuntu 14.04

    Changed the original post to reflect changed in order to handle multiple VLANs each with their unique properties. I did find a way to get the /60 prefix allocation so I can have 16 subnets to play...
  23. [ubuntu] Re: IPv6 capable edge router/firewall Comcast Ubuntu 14.04

    I made a couple of quick tweaks to the ports allowed to the firewall. Specifically I added IPv4 access to UDP port 5353 as Comcast seems to want to hit for both IP protocols it looks like. Also...
  24. [ubuntu] Re: IPv6 capable edge router/firewall Comcast Ubuntu 14.04

    I came across a possible practical use for doing your own mini-ITX system described above with Comcast beyond just being paranoid about security enough to start your own firewall from scratch...
  25. [ubuntu] Re: IPv6 capable edge router/firewall Comcast Ubuntu 14.04

    I suppose there is a fundamental problem in that when a telco just has to have the basic equipment turned on and doing something, most people will still pay for it, so the telco really does not care...
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