Vlan between a windows pc and raspbian

grip · January 2023

Hi,
I've just bought a GS1200-8 to start experimenting with VLANs at home.

I'm trying to make this scenario work:
- 2 host
- 1 GS1200-8 switch

I've created the VLAN 10 on the switch and assigned ports 1,2,3 and 7 to it as untagged.
Ports 3 to 8 remains on the default VLAN 1.

(see image)

Windows PC connected on port 7

Raspbian Raspberry Pi connected on port 3

VLAN 10 has subnet 192.168.10.0/24
VLAN 1 has subnet 192.168.1.0/24

On windows PC I've configured the single physical interface (RTL8111H) using the realtek utility, such utility has created a new virtual interface with VLAN ID 10 (I think tagged) and left the original one untouched.
I remade the protocol bindings to assign IP 192.168.10.100 to the interface with VLAN ID 10 and 192.168.1.156 (dhcp) to the other

On Raspbian I left the existing eth0 with no tag and the static IP of 192.168.1.212 and created an eth0.10 with IP 192.168.10.10

that's the output of "ip -d a show"

eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000

link/ether xx:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff promiscuity 0 minmtu 68 maxmtu 9000 numtxqueues 1 numrxqueues 1 gso_max_size 8824 gso_max_segs 65535

inet 192.168.1.212/24 brd 192.168.1.255 scope global noprefixroute eth0

valid_lft forever preferred_lft forever

inet6 fe80::/64 scope link

valid_lft forever preferred_lft forever

eth0.10@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000

link/ether xx:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff promiscuity 0 minmtu 0 maxmtu 65535

vlan protocol 802.1Q id 10 <REORDER_HDR> numtxqueues 1 numrxqueues 1 gso_max_size 8824 gso_max_segs 65535

inet 192.168.10.10/24 brd 192.168.10.255 scope global noprefixroute eth0.10

valid_lft forever preferred_lft forever

inet6 fe80::/64 scope link

valid_lft forever preferred_lft forever

what it is working are the communications using subnet 192.168.1.0/24 (ping ok, ssh ok)

nothing works on subnet 192.168.10.0/24, no ping, no arp .

what am I doing wrong?

any help will be appreciated.

Regards

Image: https://us.v-cdn.net/6029482/uploads/editor/qe/iq4kfo4qigml.png

PeterUK · January 2023

To route between subnets you need a router with VLAN support

grip · January 2023

Hi Peter,

thanks for you kind reply.

I'm not trying to route btw vlans.

I'm trying to reach from eth0.10 (VLAN10 - port 3) to Windows PC (VLAN10 - port 7)

so the communication will be over the same subnet: 192.168.10.10 <--> 192.168.10.100

I've tried from RPi with ping -I eth0.10 192.168.10.100 but with no success, even tcpdump -i eth0.10 -vv sees just the arp requests without any reply whatsoever.

I know that as it is configured now eth0 does not add any tag to the frame so I leaved the PVID 1.

I'm stuck figuring out if I have to make any changes on the switch config or may be something on the hosts...

regards and thank you for your help.

PeterUK · January 2023

Its likely you got the wrong switch and you need Port-based VLAN then 802.1Q VLAN.

Draw out what you want done.

grip · January 2023

Image: https://us.v-cdn.net/6029482/uploads/editor/3f/071fg2rt5ekl.png

the diagram is above and what I'd like to do is to be able to ping from one host to the other over VLAN10.

Right now it works only on VLAN1.

PeterUK · January 2023

Not sure it will work but set tag on ports 3 and 7 on the switch for VLAN10.

is the windows setup with VLAN tagging? 192.168.1.156 should be untagged

After testing here as long as both clients do tagging on the interface it will work.

Zyxel_Nami · January 2023

Hi @grip,

Based on your diagram, VLAN 10 on port 3 and port 7 of Switch is untagged that will remove VLAN tag on the outgoing frame, then 192.168.10.10 and 192.168.10.100 couldn’t reach each other because when the packets came out of Switch, they didn’t carry with any VLAN tag and they should be dropped by end devices on both sides if the NIC can't recognize VLAN tagged. Therefore, we’d like to advise you to change VLAN 10 on port 3 and port 7 is tagged as @PeterUK suggested.

If there are any issues, please let us know.

grip · January 2023

Hi,

thank you again for your time.

I did what you suggested and now the situation is the following

Image: https://us.v-cdn.net/6029482/uploads/editor/7b/rh7bifh4c1oh.jpg

ping output to RPi on VLAN1 on windows host:

Esecuzione di Ping 192.168.1.212 con 32 byte di dati:
Risposta da 192.168.1.212: byte=32 durata<1ms TTL=64
Risposta da 192.168.1.212: byte=32 durata<1ms TTL=64
Risposta da 192.168.1.212: byte=32 durata<1ms TTL=64
Risposta da 192.168.1.212: byte=32 durata<1ms TTL=64

Statistiche Ping per 192.168.1.212:
    Pacchetti: Trasmessi = 4, Ricevuti = 4,
    Persi = 0 (0% persi),
Tempo approssimativo percorsi andata/ritorno in millisecondi:
    Minimo = 0ms, Massimo = 0ms, Medio = 0ms

ping output to RPi on VLAN10 on windows host:

Esecuzione di Ping 192.168.10.10 con 32 byte di dati:
Richiesta scaduta.
Richiesta scaduta.
Richiesta scaduta.
Richiesta scaduta.

Statistiche Ping per 192.168.10.10:
Pacchetti: Trasmessi = 4, Ricevuti = 0,
Persi = 4 (100% persi),

arp -a on windows host:

Interfaccia: 192.168.10.100 --- 0x30
Indirizzo Internet    Indirizzo fisico      Tipo
192.168.10.255        ff-ff-ff-ff-ff-ff     statico
224.0.0.22            01-00-5e-00-00-16     statico
224.0.0.251           01-00-5e-00-00-fb     statico
224.0.0.252           01-00-5e-00-00-fc     statico
239.255.255.250       01-00-5e-7f-ff-fa     statico
255.255.255.255       ff-ff-ff-ff-ff-ff     statico

ping output to Windows on VLAN1 on RPi host:

PING 192.168.1.156 (192.168.1.156) 56(84) bytes of data.
64 bytes from 192.168.1.156: icmp_seq=1 ttl=128 time=0.614 ms
64 bytes from 192.168.1.156: icmp_seq=2 ttl=128 time=0.490 ms
64 bytes from 192.168.1.156: icmp_seq=3 ttl=128 time=0.480 ms
64 bytes from 192.168.1.156: icmp_seq=4 ttl=128 time=0.482 ms
64 bytes from 192.168.1.156: icmp_seq=5 ttl=128 time=0.497 ms
64 bytes from 192.168.1.156: icmp_seq=6 ttl=128 time=0.465 ms
64 bytes from 192.168.1.156: icmp_seq=7 ttl=128 time=0.480 ms
64 bytes from 192.168.1.156: icmp_seq=8 ttl=128 time=0.520 ms

--- 192.168.1.156 ping statistics ---
8 packets transmitted, 8 received, 0% packet loss, time 7304ms
rtt min/avg/max/mdev = 0.465/0.503/0.614/0.044 ms

ping output to Windows on VLAN10 on RPi host (using -I eth0.10):

PING 192.168.10.100 (192.168.10.100) from 192.168.10.10 eth0.10: 56(84) bytes of data.
From 192.168.10.10 icmp_seq=1 Destination Host Unreachable
From 192.168.10.10 icmp_seq=2 Destination Host Unreachable
From 192.168.10.10 icmp_seq=3 Destination Host Unreachable
From 192.168.10.10 icmp_seq=4 Destination Host Unreachable
From 192.168.10.10 icmp_seq=5 Destination Host Unreachable
From 192.168.10.10 icmp_seq=6 Destination Host Unreachable

--- 192.168.10.100 ping statistics ---
7 packets transmitted, 0 received, +6 errors, 100% packet loss, time 6257ms

arp -e on RPi host:

192.168.10.100 (incomplete) eth0.10

192.168.1.156 ether xx:xx:xx:xx:xx:xx C eth0

so nothing is changed from before, ping on VLAN10 still does not get through.

Any ideas?!

Regards

Zyxel_Nami · January 2023

Hi @grip,

In reference to the first message specifying vlan protocol 802.1Q id 10 on eth0.10@eth0 part, we believe that Raspbian Raspberry Pi can support VLAN tag and can send VLAN tag packet. Therefore, we would like to check on Windows if NIC RTL8111H is really possible to add VLAN tag or not, so could you please change PVID into PVID 10 and untagged VLAN 10 on port 7?

If 192.168.10.10 and 192.168.10.100 can ping each other after the test above, please check your configuration for VLAN 10 tagged on Realtek utility.

By the way, would you share us more information about the Realtek utility you mentioned early such as name or download link are all appreciated? We would like to reproduce similar environment if there still are problems after you test PVID 10 and check on Realtek utility.

grip · January 2023

Hi Nami,
I also have doubts that the Windows system is correctly tagging packets but I don't know how to verify this.

I did what you suggested with PVID but nothing changed

Image: https://us.v-cdn.net/6029482/uploads/editor/ky/20u1i3zvubax.jpg

The Realtek utility is the one you can download from this page https://www.realtek.com/en/component/zoo/category/network-interface-controllers-10-100-1000m-gigabit-ethernet-pci-express-software

and the file name is "Diagnostic Program for Win7/Win8/Win10/Win11"

Hope you will find something useful to solve this behaviour.

Regards

Zyxel_Nami · January 2023

Hi @grip

Thanks for your sharing. We will reproduce the environment with the information of Realtek utility you provided. While waiting for our test, we advise that you may check the packet frame by Wireshark on both hosts to see if the packets sending from these two hosts are really added VLAN 10 tags or not.

In addition, you can give a try on port 3 settings that changing into PVID 10 and untagged VLAN 10, then the configuration of VLAN 1 and VLAN 10 will be the same.

After that, if VLAN 10 hosts can ping each other, the configuration on RPi's eth0.10@eth0 should be looked over, therefore please also provide us the configuration step of VLAN on this interface.

Best Regards

Vlan between a windows pc and raspbian

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