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server – do 20.04 bridges work? what’s amis with mine? do i need a special kernel?

Trying to setup a bridge for libvirt using 20.04 netplan. Network is fine before trying to define a bridge, but doesn’t come up with my bridge definition. What am i missing?

Do i need a special kernel? See why i pose this question right near the bottom.

Before trying to define a bridge the network works fine with this:

  #  cat /etc/netplan/00-installer-config.yaml
# This is the network config written by 'subiquity'
network:
  ethernets:
    eno1:
      addresses:
      - 10.3.8.12/21
      gateway4: 10.3.8.3
      nameservers:
        addresses:
        - 10.3.8.3
  version: 2

Trying to setup a bridge i change the contents to:

network:
  ethernets:
    eno1:
      dhcp4: false
      dhcp6: false
  bridges:
    br96:
      interfaces: ( eno1 )
      addresses: (10.3.8.12/21)
      gateway4: 10.3.8.3
      nameservers:
        addresses: (10.3.8.3)
  version: 2

Below i show ‘ip a’ before and after applying the netplan, networkctl status, et al. Can anyone clue me what’s amis?

  $  ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 40:a8:f0:67:12:46 brd ff:ff:ff:ff:ff:ff
    inet 10.3.8.12/21 brd 10.3.15.255 scope global eno1
       valid_lft forever preferred_lft forever
    inet6 fe80::42a8:f0ff:fe67:1246/64 scope link
       valid_lft forever preferred_lft forever

  #  netplan --debug generate
DEBUG:command generate: running ('/lib/netplan/generate')
** (generate:1386): DEBUG: 09:50:10.524: Processing input file /etc/netplan/00-installer-config.yaml..
** (generate:1386): DEBUG: 09:50:10.524: starting new processing pass
** (generate:1386): DEBUG: 09:50:10.524: We have some netdefs, pass them through a final round of validation
** (generate:1386): DEBUG: 09:50:10.524: eno1: setting default backend to 1
** (generate:1386): DEBUG: 09:50:10.524: Configuration is valid
** (generate:1386): DEBUG: 09:50:10.524: br96: setting default backend to 1
** (generate:1386): DEBUG: 09:50:10.524: Configuration is valid
** (generate:1386): DEBUG: 09:50:10.524: Generating output files..
** (generate:1386): DEBUG: 09:50:10.524: openvswitch: definition eno1 is not for us (backend 1)
** (generate:1386): DEBUG: 09:50:10.524: NetworkManager: definition eno1 is not for us (backend 1)
** (generate:1386): DEBUG: 09:50:10.524: openvswitch: definition br96 is not for us (backend 1)
** (generate:1386): DEBUG: 09:50:10.524: NetworkManager: definition br96 is not for us (backend 1)
(generate:1386): GLib-DEBUG: 09:50:10.524: posix_spawn avoided (fd close requested)
(generate:1386): GLib-DEBUG: 09:50:10.525: posix_spawn avoided (fd close requested)
  0# netplan apply
(ssh connection drops)
  # reboot
(comes up with no network)

  $  ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 40:a8:f0:67:12:46 brd ff:ff:ff:ff:ff:ff

  #  head -99 /r*/s*/n*k/*
==> /run/systemd/network/10-netplan-br96.netdev <==
(NetDev)
Name=br96
Kind=bridge

==> /run/systemd/network/10-netplan-br96.network <==
(Match)
Name=br96

(Network)
LinkLocalAddressing=ipv6
Address=10.3.8.12/21
Gateway=10.3.8.3
DNS=10.3.8.3
ConfigureWithoutCarrier=yes

==> /run/systemd/network/10-netplan-eno1.network <==
(Match)
Name=eno1

(Network)
LinkLocalAddressing=no
Bridge=br96

  #  networkctl
IDX LINK TYPE OPERATIONAL SETUP
  1 lo loopback carrier unmanaged
  2 eno1 ether no-carrier pending

2 links listed.

  0#  networkctl status -a
Failed to query link bit rates: Unit dbus-org.freedesktop.network1.service not found.
Failed to query link bit rates: Unit dbus-org.freedesktop.network1.service not found.
● 1: lo
             Link File: /usr/lib/systemd/network/99-default.link
          Network File: n/a
                  Type: loopback
                 State: carrier (unmanaged)
                   MTU: 65536
  Queue Length (Tx/Rx): 1/1
               Address: 127.0.0.1
                        ::1

● 2: eno1
             Link File: /usr/lib/systemd/network/99-default.link
          Network File: n/a
                  Type: ether
                 State: no-carrier (pending)
                  Path: pci-0000:00:19.0
                Driver: e1000e
                Vendor: Intel Corporation
                 Model: Ethernet Connection I217-LM
            HW Address: 40:a8:f0:67:12:46 (Hewlett Packard)
                   MTU: 1500 (min: 68, max: 9000)
  Queue Length (Tx/Rx): 1/1
      Auto negotiation: yes
                 Speed: 1Gbps
                Duplex: full
                  Port: tp

Jan 15 11:07:30 filbert systemd-networkd(752): eno1: Could not join netdev: No such device
Jan 15 11:07:30 filbert systemd-networkd(752): eno1: Failed
Jan 15 11:07:30 filbert systemd-networkd(756): eno1: Could not join netdev: No such device
Jan 15 11:07:30 filbert systemd-networkd(756): eno1: Failed
Jan 15 11:07:30 filbert systemd-networkd(758): eno1: Could not join netdev: No such device
Jan 15 11:07:30 filbert systemd-networkd(758): eno1: Failed
Jan 15 11:07:30 filbert systemd-networkd(760): eno1: Could not join netdev: No such device
Jan 15 11:07:30 filbert systemd-networkd(760): eno1: Failed
Jan 15 11:07:30 filbert systemd-networkd(763): eno1: Could not join netdev: No such device
Jan 15 11:07:30 filbert systemd-networkd(763): eno1: Failed

  0#  journalctl -xe|grep networkd
(redacted, askubuntu says it "looks like spam")

  0#  dpkg -l *netplan*
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-=================-======================-============-===========================================================
ii libnetplan0:amd64 0.100-0ubuntu4~20.04.3 amd64 YAML network configuration abstraction runtime library
un netplan <none> <none> (no description available)
ii netplan.io 0.100-0ubuntu4~20.04.3 amd64 YAML network configuration abstraction for various backends
lines 1-8/8 (END)

  0#  apt-get install netplan
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package netplan is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'netplan' has no installation candidate
  100#  cat /etc/apt/sources.list
(edited to redact "links")
deb ... focal main restricted
deb ... focal-updates main restricted
deb ... focal universe
deb ... focal-updates universe
deb ... focal multiverse
deb ... focal-updates multiverse
deb ... focal-backports main restricted universe multiverse
deb ... focal-security main restricted
deb ... focal-security universe
deb ... focal-security multiverse
  0#  ls -ld /etc/apt/sources.list*/*
ls: cannot access '/etc/apt/sources.list*/*': No such file or directory
  2#

So i tried ‘apt-get install ifupdown’ and tried this in /etc/network/interfaces:

auto lo
iface lo inet loopback

auto eno1
iface eno1 inet static
      address 10.3.8.12
      netmask 255.255.248.0
      gateway 10.3.8.3
      dns-nameserver 10.3.8.3

That works, so next i tried with a bridge:

auto lo
iface lo inet loopback

auto br0
iface br0 inet static
   bridge_ports eno1
      address 10.3.8.12
      netmask 255.255.248.0
      gateway 10.3.8.3

And that doesn’t work. So i tried:

  #  ifup br0
add bridge failed: Package not installed
run-parts: /etc/network/if-pre-up.d/bridge exited with return code 1
ifup: failed to bring up br0

That means “You don’t have kernel support for bridging…Compile it in. It should be in ‘Networking’ → ‘Networking options’.” according to http://helpful.knobs-dials.com/index.php/Networking_notes_-_the_lower_three_levels#Add_bridge_failed:_Package_not_installed

So do i need a special kernel?

dnd 5e – Is “a special melee attack” an actual game term?

PHB page 195 mentions “special melee attack” when talking about Grapple and Shove:

you can make a special melee attack to shove a creature

you can use the Attack action to make a special melee attack, a grapple

It uses words “make a special melee attack” like it is a thing in 5e, however, nowhere in the game text it’s being said what a “special melee attack” actually is. It isn’t even mentioned anymore. I believe that “special attack” is not a game term — it’s a vestige from the previous editions, where “special attacks” was a thing, but I could be mistaken.

Are there any other examples of “special melee attack” (or just “special attack”) in any official source book for 5e?

I was searching through dndbeyond and the only thing I’ve found was Sword Of Answering. But it uses words “special attack” in the context of the magic item description:

while you hold the sword, you can use your reaction to make one melee attack

any damage dealt with this special attack ignores any damage immunity or resistance the target has

You can remove the word “special” from its description and nothing changes. So it is plain English meaning here, not the game term.

So what is a “special attack” in terms of the game mechanics?

the database system to store any value associated with such external writes temporarily in a special relation in the database

The text below is from the book Database System Concepts by Silberschatz.
Why the values associated with external writes need to be stored in a special relation in the database? Can’t we behave with these values like other values?

We must be cautious when dealing with observable external writes, such as writes
to a user’s screen, or sending email. Once such a write has occurred, it cannot be
erased, since it may have been seen external to the database system. Most systems
allow such writes to take place only after the transaction has entered the committed
state. One way to implement such a scheme is for the database system to store any value
associated with such external writes temporarily in a special relation in the database
,
and to performthe actual writes only after the transaction enters the committed state. If
the system should fail after the transaction has entered the committed state, but before
it could complete the external writes, the database system will carry out the external
writes (using the data in non-volatile storage) when the system is restarted.

transaction verification – Full list of “special cases” during Bitcoin Script execution (p2sh, p2wsh, etc.)?

When executing a Bitcoin Script, there are some “special cases” where the interpreter performs extra verification beyond just executing scriptSig and then scriptPubKey.

For example, if the scriptPubKey has the following specific format:

OP_HASH160 <20 byte hash> OP_EQUAL

then the interpreter will additionally apply the BIP 0016 “Pay to Script Hash” (P2SH) rules.

What’s the full list of “special cases” that could be encountered during Script execution, and when is each encountered?

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What’s special about flights SU 6496, 1883 and 1895?

According to IATA’s rules on entering Russia:

Passengers are not allowed to enter.

  • This does not apply to:
  • nationals of the Russian Fed. and their family members;
  • nationals and residents of Belarus if arriving from Belarus (not traveling on flights FV/SU6496);
  • nationals and residents of Kyrgyzstan if arriving from Kyrgyzstan (not traveling on flights SU1883 and SU1895).

What’s special about these three flights? Why does Russia specifically exclude them?

ag.algebraic geometry – Most divisors on a curve aren’t special?

I have a generic smooth curve $C$ of genus $g$ and fixed multiplicities $a_1, dots, a_n geq 0$ with $sum a_i = g+1$.

Q1 : For generic marked points $p_1, dots, p_n in C$, must $sum a_i p_i$ be a non-special divisor?

If $n$ is one, I just have to avoid the finitely many Weierstrass points, and I’m looking for an analogy of this for special divisors. If the union of the supports of all special divisors was finite, that’d be great, but the spaces $G^r_d$ can be greater dimension than the curve. Even though I can make the support of the divisor generic, the multiplicities are fixed.

Q2 : For generic marked points and any $b_1, dots, b_n$, $0 leq b_i < a_i$, must $sum b_i p_i$ be non-special? What if $sum b_i = g$?

I was reading Akhil Matthew’s notes on a course by Joe Harris, and the proof that there are finitely many Weierstrass points is “something that eventually becomes obvious.” I’m trying to generalize this, so I’d appreciate being made aware if there is a related result. A paper casually claims that $H^1(mathcal{O}(D)) = 0$ for a generic divisor of degree $g$ and I’m trying to check it.

Apologies that I’m quite inexperienced with curves.

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