networking – Directly connecting two computer also on same LAN

This might be a weird one, which is probably why I couldn’t find anything on searches.

I have two machines on the same network connected to the same switch via Gigabit Ethernet. One is my main workstation, running Windows 10, the other is my server, running Windows Server 2016. These two machines are within a few feet of each other and I’d like to get a better transfer rate between the two. Ideally I’d like a 10G link between the two, but one of the machines (the server) has no more room for internal expansion (and no thunderbolt). My plan is to fit that one with a USB 3.1 Gen 2 5Gb Ethernet adapter, and the other with an internal PCIe 10Gb Ethernet adapter. I then want to directly connect the two, while also leaving in place the current 1Gb network connections to the main network/internet. None of the other machines on the network need a faster link, so upgrading the infrastructure isn’t practical.

So my question before I do all this… when I go to copy files between the two machines, is Windows smart enough to use the faster link, or is it going to be dumb and go through the network switch on the 1Gb connection? If it’s dumb, can I override this with a hosts file for the static IP4/IP6 addresses on each computer?

vpn – OpenVPN: How to issue client IP on the same subnet as the server LAN

Is it possible to issue a client an IP address on the same subnet as the server LAN? For example, if the server’s IP address is, I would like to assign the connecting clients an IP on the same subnet. Something like I’m hoping this will help with routing as I have a need to connect to an internal system ( that is having trouble routing packets back to the connected VPN client machine.

My current conf:

dev tun
proto tcp
port 443
ca /etc/openvpn/easy-rsa/pki/ca.crt
cert /etc/openvpn/easy-rsa/pki/issued/server.crt
key /etc/openvpn/easy-rsa/pki/private/key.key
dh none
ecdh-curve prime256v1
topology subnet
push "dhcp-option DNS"
push "dhcp-option DNS"
# Prevent DNS leaks on Windows
push "block-outside-dns"
push "redirect-gateway def1"
keepalive 15 120
remote-cert-tls client
tls-version-min 1.2
tls-crypt /etc/openvpn/easy-rsa/pki/ta.key
cipher AES-256-CBC
auth SHA256
user openvpn
group openvpn
crl-verify /etc/openvpn/crl.pem
status /var/log/openvpn-status.log 20
status-version 3
verb 3

Once connected, I’m being issued an IP of which is what I would expect but I’m not able to ping or access the internet.

When I had the server configured with a server and an iptables NAT route like

iptables -t nat -A POSTROUTING -s -o eth0 -j MASQUERADE

that worked, but I was still having a routing issue from an internal system back to the client. Again, was hoping that could be resolved by placing the client on the same subnet as the internal systems.

router – Vigor – Mapping of known IPSEC / Cisco VPN parameters to a lan to lan connection

I have the following (fictitious) VPN connection settings that work correctly on my MacOS to connect to my desktop VPN


I would like to use these settings to create a lan to lan connection on my Vigor 2926ac router, but I am unable to translate these settings in the Vigor VPN settings.

Question: Does the Vigor router support this type of configuration and if so, what is the Vigor terminology for this type of VPN?

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network – ipv6 and dnsmasq on lan. Macs have no route to host, Windows and Linux work

I have a small mixed network of ubuntu linux (20.04) windows 10 and three macs. My ISP is starting to assign IPv6 (not yet in my area), and wanted to try on my network.
I manage the network using dnsmasq (running on the Ubuntu server) and it allocates the IP address and works as a caching DNS server.
I have disabled all IPv6 options on my router (other than the firewall)

To start testing IPv6, I added the following lines to dnsmasq.conf:


and sympathetically, it works for Windows and Linux machines. for example

nick@serv2:~$ ping6 htpc
PING htpc( (fd52:a81c:df85::85)) 56 data bytes
64 bytes from (fd52:a81c:df85::85): icmp_seq=1 ttl=64 time=0.573 ms

However, all macs seem unhappy with the configuration, for example:

nick@deathrow ~ % ping6 serv2
ping6: UDP connect: No route to host

In the background, the ifconfig on my mac is as follows:

nick@deathrow ~ % ifconfig en0
en0: flags=8863 mtu 1500
    ether 34:36:3b:78:15:54 
    inet6 fe80::64:48f:2265:db5%en0 prefixlen 64 secured scopeid 0x5 
    inet netmask 0xffffff00 broadcast
    inet6 fd52:a81c:df85::2c prefixlen 64 dynamic 
    nd6 options=201
    media: autoselect
    status: active

The other oddity is when I look at the leases issued by dnsmasq I get the following:

nick@serv2:~$ cat /var/lib/misc/dnsmasq.leases
1589092434 34:36:3b:78:15:54 deathrow 01:34:36:3b:78:15:54
1589085665 b4:2e:99:41:5d:bc kenickie 01:b4:2e:99:41:5d:bc
1589081204 38:f9:d3:90:fd:dd richard 01:38:f9:d3:90:fd:dd
1589084172 8c:85:90:56:bc:bf Hal 01:8c:85:90:56:bc:bf
1589093362 70:85:c2:7d:06:f7 htpc ff:48:6b:fd:2c:00:02:00:00:ab:11:ae:2f:a0:8e:34:1e:dd:53
1589093437 b4:2e:99:02:99:47 DESKTOP-N5V06NB 01:b4:2e:99:02:99:47
duid 00:01:00:01:26:49:5c:40:18:31:bf:6a:35:bc
1589085667 611457736 fd52:a81c:df85::b3 kenickie 00:04:ae:f8:4e:bd:71:95:c3:42:1b:ef:bd:3b:8f:e6:1a:86
1589093364 1215036716 fd52:a81c:df85::85 htpc 00:02:00:00:ab:11:ae:2f:a0:8e:34:1e:dd:53
1589093429 112471705 fd52:a81c:df85::11 DESKTOP-N5V06NB 00:01:00:01:25:90:f0:6c:b4:2e:99:02:99:47
1589080658 0 fd52:a81c:df85::42 * 00:01:00:01:25:b1:94:dc:38:f9:d3:90:fd:dd
1589084172 0 fd52:a81c:df85::f * 00:01:00:01:22:48:2d:b0:8c:85:90:56:bc:bf
1589092435 0 fd52:a81c:df85::2c * 00:01:00:01:24:86:78:14:34:36:3b:78:15:54

You can see that the three Macs (deathrow, Hal and Richard) all get their IPv4 names listed ok, but for IPv6 you can see (lest three lines) their names are replaced by * (ubuntu hosts – kenickie and htpc, and the Windows machine DESKTOP-N5V06NB) are listed with an IPv6 address by name. (serv2 is not listed – it has a static address)

Do I need to do something more in dnsmasq for Mac (or did I do something fundamentally and it's just that Macs are less tolerant)?

linux – Unable to connect to my personal Ubuntu server with SSH outside the LAN

It is the first time I configure a server and I have a problem. When I try to connect to my server with SSH inside the LAN, everything works fine, but when I am not at home and I try to connect, it happens:

OpenSSH_for_Windows_7.7p1, LibreSSL 2.6.5
debug3: Failed to open file:C:/Users/MY_USERNAME/.ssh/config error:2
debug3: Failed to open file:C:/ProgramData/ssh/ssh_config error:2
debug2: resolving "MY_DDNS_ADDRESS" port 22
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to MY_DDNS_ADDRESS [MY_IP_ADDRESS] port 22.
debug3: finish_connect - ERROR: async io completed with error: 10061, io:000001FB2C4C0400
debug1: connect to address MY_IP_ADDRESS port 22: Connection refused
ssh: connect to host MY_DDNS_ADDRESS port 22: Connection refused

I do not understand why the connection is refused. Here is what I have already done:

- Forward port 22 traffic to my server in my router settings
- Allowing port 22 traffic in UFW on my server
- Try to connect to my server from different locations

Anyone know what the problem is?

applications – My ES File Explorer application does not have a LAN button?

I have done a lot of reading on the best way to access my WD mycloud on my phone without having to use the WD app. Most people seem to think that ES file explorer is the solution.

The problem is that the read instructions tell me to press the "LAN" button to connect the player over the network. In my app, I don't have a LAN button coming up. (Screenshot below).

Am i in the wrong place Or do I have the wrong application? I have no idea what I'm doing wrong.

Thank you and thank you to everyone who could help me!

Actress Qin Lan posts new photos

Actress Qin Lan posts new photos

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computer networks – Understanding transfer tables in transparent LAN bridges

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I'm having trouble understanding how transparent bypass works. With this diagram, I am told that:

After initialization (none of the transparent bridges has state information), the following six frames
are sent:
1: A -> D
2: B -> A
3: C -> B

I don't really understand what A->D actually means. A frame is sent from A to D? Or are these the two frames?

By definition, I know that each time a frame is received, we add an entry to the forwarding database (if it is)
do not exist yet.) These are the transfer tables after the exchange of the 3 frames but I do not understand how they are derived exactly. Any example would be helpful.

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networking – linux 10gbe ixgbe (intel X550T) slow at 420 MB / s max, p2p lan cat8 1m, tried ethtool and ifconfig options to no avail

first time with 10gbe.

I have two boxes, one is older with i7 2.8ghz generation 2009, pcie 2.0 and I just put the Intel X550T in it to use an absolutely similar but integrated adapter on my new case with AMD EPYC gen 1.

I drag the tmpfs file to one or the other box and never exceed 415 MB / s, which is about half of the potential bandwidth, right?

I have tried most of the stuff from with a small improvement from 393 MB / s to 415 in progress. This is the result of my configuration of MTU 9000, txqueuelen 10000.

Also tried this without any improvement compared to the current result:

And a few other pages on google, most showing the same options.

I don't see a 100% charge burst on the i7 box when I upload a file, it's about 10% on the cores. So the processor shouldn't be a bottleneck, the cable (it's 1 meter of cat8, with nice thick shielding) shouldn't be a bottleneck and the speed of the ram and pcie 2.0 speed shouldn't be.
iperf also reports the same speed.

I have tried these tests back and forth.

There must be something obvious that I miss, right?

I'm sure it doesn't matter, but it's lfs on i7 and debian 10 on epyc, sharing the same sysctl settings and options controlled by ethtool.

lspci -n for this on both computers: 62:00.0 0200: 8086:1563 (rev 01) it is therefore a similar device. I bought this particular one for compatibility reasons, but I didn't expect these issues.

Maybe someone here would suggest something, I have no more ideas.


wi fi – Dual Boot Android x86 but LAN does not work. Applications always ask for wifi

I just double booted Android x86 64bit 9.0 r2 on my laptop alongside Windows.

Throughout the configuration wizard, he kept asking me to connect to wifi when I had a working Ethernet connection. I do not want to use wifi due to signal strength issues.

Is there a solution to this?