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    Re: Kernel 5.2RC (Release Candidate) series

    The patch has been merged into upstream mainline, so the Ubuntu daily for July 21st should compile properly.
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    Re: Kernel 5.2RC (Release Candidate) series

    You can also see people on the bug report asking for the mainline build to be fixed. However it has to wait for the fix, which has been picked up, to make it into the upstream mainline, which it...
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    Re: Kernel 5.2RC (Release Candidate) series

    For users wanting to compile the mainline 5.2 kernel for themselves, and with the newer compiler included with 19.10 do this:


    doug@serv-ee:~/temp-k-git/linux$ git diff
    diff --git a/Makefile...
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    Re: Kernel 5.2RC (Release Candidate) series

    Yes, but it is my understanding (without looking at your link) that the issue is a systemd problem. I saw a bug report just yesterday about it, with a patch. I'll see if I can find it again. Oh, it...
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    Re: Kernel 5.2RC (Release Candidate) series

    Interesting. I am still on kernel 5.2-rc5, due to some continuing testing. I see the daily build worked until yesterday. I'll try to compile it myself shortly.

    EDIT 1: Looks like a messed up...
  6. Re: Netflix tcp_sack vulnerability hosing things

    This is a really interesting thread. My system has always had a lot of duplicate ack packets and re-transmissions and such, and I have always wanted to investigate, but never got around to it....
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    [SOLVED] Re: Networking subnets and confusion

    iptables can take considerable time to learn thoroughly, but I think it is worth it. However, and as mentioned earlier, I only have experience with one local sub-net.

    While overly complicated as a...
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    [SOLVED] Re: Networking subnets and confusion

    +1. I do exactly this. My wifi router is basically a switch. It also has a static LAN ip addresss outside of my dhcp server dynamic address pool, so that I can still talk to it, when needed. It has...
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    [SOLVED] Re: Web server and virtual hosting

    Gee, and I thought UFW generated iptables rules were hard to read and follow.

    Anyway, the relevant chain is "iglobal" and it doesn't have port 80 or 443 in its list, so no it won't work. You'll...
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    [SOLVED] Re: Web server and virtual hosting

    So based on the below part, it seems your box is not a router. Then why are you doing port forwarding? As a test flush the nat tables, but leave the rest:


    sudo iptables -t nat -F

    Oh!! Thanks...
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    [ubuntu] Re: No full RAM memory usage

    Yes, you need to increase the limits, a lot.
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    [ubuntu] Re: No full RAM memory usage

    Interesting.
    I do not understand your output for "free -m", as it suggests you only have ~4 gigabytes of ram. did you mean to write "free -g"?

    I have an old program used to test how much memory I...
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    [ubuntu] Re: Breaking a TCP connection

    How about this:


    apt-get install libnetpacket-perl libnet-pcap-perl libnet-rawip-perlCopy and pasted from here.
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    [ubuntu] Re: Breaking a TCP connection

    Agreed. I actually didn't expect the conntrack table entry to disappear, just showed it for completeness. And, also I showed that the connection was actually still working in my tcpdump capture,...
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    [ubuntu] Re: Breaking a TCP connection

    Already installed on one of my computers is "hping3", which can send almost what you want, but I don't know the proper sequence number to provide:


    $ sudo hping3 --count 1 --spoof 192.168.111.1...
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    [SOLVED] Re: Web server and virtual hosting

    Your iptables NAT rules are somewhat of a surprise. Previously it wasn't obvious to me that your box is also a router. You need to describe your network to us in more detail. Also, we need to see the...
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    [ubuntu] Re: Breaking a TCP connection

    If you put the rule before the typical REALATED,ESTABLISHED rule, it'll drop any packets from the IP, regardless. Chains that are only traversed once for NEW connections are, for example the nat...
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    [ubuntu] Re: Breaking a TCP connection

    You could use iptables to force a DROP:


    sudo iptables -I INPUT 1 -s 100.101.102.103 -i enp4s0 -j DROP

    And actually, I do this on my system often. If you have an existing iptables rules set,...
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    [SOLVED] Re: Web server and virtual hosting

    Do you know for certain that packets actually arrive at your server? One way to check is to use tcpdump (or wireshark, if you prefer) and watch the related traffic. Example:


    doug@DOUG-64:~$ sudo...
  20. [SOLVED] Re: Unable to establish SSH Connection through Router

    As long as you realize that this explanation is inconsistent with your tcpdump data.
  21. [SOLVED] Re: Unable to establish SSH Connection through Router

    That is not sufficient to know for sure that there are not any rules getting in the way. There probably aren't, but this is a weird one, so better check. Do:


    sudo iptables-save -c
  22. [SOLVED] Re: Unable to establish SSH Connection through Router

    Show us the output as per below (in my case it's port 22):


    doug@s15:~/ubuntu-help/16.04/serverguide$ sudo netstat -tlunp
    Active Internet connections (only servers)
    Proto Recv-Q Send-Q Local...
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    Re: Kernel 5.2RC (Release Candidate) series

    Have you tried 5.2-rc5? I only know of bisecting the kernel as a way to isolate the exact commit that caused your problem. That being said, I did find an upstream bug report and also see a fix...
  24. [ubuntu_studio] Re: Chosing lowlatency kernel or regular kernel

    Some simple test results (kernel 5.2-rc5 1000 Hz tick rate ("lowlatency") and 250 Hz tick rate ("generic"):

    Idle system (and by "Idle", I really mean it, as my test server has no GUI and I...
  25. [ubuntu_studio] Re: Chosing lowlatency kernel or regular kernel

    I would be very interested in that thread, because those results do not make sense to me. By the way, telling us the CPU frequency scaling governor is not enough information, we also need to know the...
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