Hello,
I've got fairly simple infrastructure with a single PVE host (OK, it's a member of bigger cluster, but it's not a case) and two Debian-based VMs.
On of these VMs (called gw) has two network interfaces and acts as a network gateway for a second one. Second VM (called test) has a single interface only:
And here's my problem:
My uplink should be around 1Gbps, so it works fine from gw. But download speed from "test" VM is terrbily slow.
Never seen such issue, and I cannot find a way to fix it :-(
Proxmox host was rebooted, VMs were re-created from a scratch (from Debian 12 ISO and Ubuntu 24.04 cloud image).
Without any change here.
Proxmox host:
First VM:
Second VM:
I've got fairly simple infrastructure with a single PVE host (OK, it's a member of bigger cluster, but it's not a case) and two Debian-based VMs.
On of these VMs (called gw) has two network interfaces and acts as a network gateway for a second one. Second VM (called test) has a single interface only:
Code:
+==========proxmox host============+
| |
| +---vm1------+ +---vm2---+ |
| | | | | |
| | | | | |
| | | | | |
| +-eth0--eth1-+ +-eth0----+ |
| | | | |
| | | | |
| | +-vmbr1.200-+ |
| vmbr1 |
| | |
| | |
| | |
+===enp2s0f1np1====================+And here's my problem:
Code:
root@test:~# ./speedtest --progress=no
Idle Latency: 4.09 ms (jitter: 0.09ms, low: 4.02ms, high: 4.22ms)
Download: 8.12 Mbps (data used: 14.0 MB)
4.08 ms (jitter: 0.14ms, low: 3.94ms, high: 5.42ms)
Upload: 772.71 Mbps (data used: 588.0 MB)
15.57 ms (jitter: 0.78ms, low: 3.98ms, high: 17.94ms)
Packet Loss: 0.0%
root@gw:~# ./speedtest --progress=no
Idle Latency: 3.89 ms (jitter: 0.02ms, low: 3.88ms, high: 3.93ms)
Download: 830.90 Mbps (data used: 1.5 GB)
4.00 ms (jitter: 0.14ms, low: 3.90ms, high: 6.82ms)
Upload: 742.85 Mbps (data used: 484.8 MB)
16.29 ms (jitter: 0.95ms, low: 4.00ms, high: 18.74ms)
Packet Loss: 0.0%Never seen such issue, and I cannot find a way to fix it :-(
Proxmox host was rebooted, VMs were re-created from a scratch (from Debian 12 ISO and Ubuntu 24.04 cloud image).
Without any change here.
Proxmox host:
Code:
# cat /etc/network/interfaces
iface enp2s0f0np0 inet manual
iface enp2s0f1np1 inet manual
auto vmbr0
iface vmbr0 inet static
address a.b.c.d
gateway e.f.g.h
bridge-ports enp2s0f0np0
bridge-stp off
bridge-fd 0
auto vmbr1
iface vmbr1 inet manual
bridge-ports enp2s0f1np1
bridge-stp off
bridge-fd 0
bridge-vlan-aware yes
bridge-vids 2-4094
auto vmbr1.200
iface vmbr1.200 inet staticFirst VM:
Code:
# cat /etc/network/interfaces
allow-hotplug ens18
iface ens18 inet static
address x.y.z.105/27
gateway x.y.z.126
dns-nameservers 8.8.8.8
iface ens19 inet static
address 10.10.10.1/24
# history
iptables -t nat -A POSTROUTING -o ens18 -j MASQUERADE
sysctl net.ipv4.conf.all.forwarding=1
sysctl net.ipv4.conf.all.rp_filter=0Second VM:
Code:
# cat /etc/network/interfaces
allow-hotplug ens18
iface ens18 inet static
address 10.10.10.2/24
gateway 10.10.10.1
dns-nameservers 8.8.8.8