[SOLVED] can't ping host but VMs work fine

borjaevo

New Member
Feb 1, 2022
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Hello,

I'm a little bit lost... yesterday i did a RAM upgrade to the server so i have to reboot it. Now, i cannot establish connection with proxmox GUI neither ping the machine. I have two interfaces configured with different IPs, one FC 10GB and the other one is standard 1GB. I can connect to the VMs using RDP or guacamole and all of them have Internet connection and LAN and can ping and access other machines. But no one, VMs or external, can ping the host. What could be the reasons of this behavior?
Its a bit problematic because im in other location and cant access using ssh.
 
Hi,

Did you check the firewall? can you please also post the output of ip a?
There are some machines that can use the GUI but i don't understand why... maybe something about ARP cache. I did a network scan from one of the systems it can't ping the host and it detects the IP, the only thing i can see could be a problem is both interfaces have same MAC. How could it be?
 
Hi,

Did you check the firewall? can you please also post the output of ip a?
I'm sorry, i forgot to post the output of ip a:

root@pve1:~# 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: ens2f0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/ether 00:1b:21:91:d0:18 brd ff:ff:ff:ff:ff:ff
3: eno49: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq master vmbr1 state UP group default qlen 1000
link/ether 3c:a8:2a:25:09:b8 brd ff:ff:ff:ff:ff:ff
4: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq master vmbr0 state UP group default qlen 1000
link/ether 30:e1:71:6d:86:f4 brd ff:ff:ff:ff:ff:ff
5: ens2f1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/ether 00:1b:21:91:d0:19 brd ff:ff:ff:ff:ff:ff
6: eno2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether 30:e1:71:6d:86:f5 brd ff:ff:ff:ff:ff:ff
inet 192.168.2.1/24 scope global eno2
valid_lft forever preferred_lft forever
inet6 fe80::32e1:71ff:fe6d:86f5/64 scope link
valid_lft forever preferred_lft forever
7: eno50: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/ether 3c:a8:2a:25:09:bc brd ff:ff:ff:ff:ff:ff
8: eno3: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/ether 30:e1:71:6d:86:f6 brd ff:ff:ff:ff:ff:ff
9: eno4: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/ether 30:e1:71:6d:86:f7 brd ff:ff:ff:ff:ff:ff
10: vmbr0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether 30:e1:71:6d:86:f4 brd ff:ff:ff:ff:ff:ff
inet 192.168.1.219/24 scope global vmbr0
valid_lft forever preferred_lft forever
inet6 fe80::32e1:71ff:fe6d:86f4/64 scope link
valid_lft forever preferred_lft forever
11: vmbr1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether 3c:a8:2a:25:09:b8 brd ff:ff:ff:ff:ff:ff
inet 192.168.1.220/24 scope global vmbr1
valid_lft forever preferred_lft forever
inet6 fe80::3ea8:2aff:fe25:9b8/64 scope link
valid_lft forever preferred_lft forever
12: tap100i0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master fwbr100i0 state UNKNOWN group default qlen 1000
link/ether 52:ab:56:6b:4e:03 brd ff:ff:ff:ff:ff:ff
13: fwbr100i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether 02:90:73:e2:01:87 brd ff:ff:ff:ff:ff:ff
14: fwpr100p0@fwln100i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master vmbr1 state UP group default qlen 1000
link/ether 0a:50:3c:76:29:f3 brd ff:ff:ff:ff:ff:ff
15: fwln100i0@fwpr100p0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr100i0 state UP group default qlen 1000
link/ether 02:90:73:e2:01:87 brd ff:ff:ff:ff:ff:ff
16: tap106i0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master fwbr106i0 state UNKNOWN group default qlen 1000
link/ether c2:1c:63:fb:30:38 brd ff:ff:ff:ff:ff:ff
20: tap108i0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master fwbr108i0 state UNKNOWN group default qlen 1000
link/ether 4a:9a:9c:1e:9a:c9 brd ff:ff:ff:ff:ff:ff
21: fwbr108i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether 56:a7:4b:d9:e5:25 brd ff:ff:ff:ff:ff:ff
22: fwpr108p0@fwln108i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master vmbr1 state UP group default qlen 1000
link/ether f6:7a:4f:af:5d:02 brd ff:ff:ff:ff:ff:ff
23: fwln108i0@fwpr108p0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr108i0 state UP group default qlen 1000
link/ether 56:a7:4b:d9:e5:25 brd ff:ff:ff:ff:ff:ff
24: tap109i0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master fwbr109i0 state UNKNOWN group default qlen 1000
link/ether 26:b8:0f:3a:d0:8d brd ff:ff:ff:ff:ff:ff
25: fwbr109i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether 46:d0:3d:7f:67:ac brd ff:ff:ff:ff:ff:ff
26: fwpr109p0@fwln109i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master vmbr1 state UP group default qlen 1000
link/ether d2:96:b5:48:48:4e brd ff:ff:ff:ff:ff:ff
27: fwln109i0@fwpr109p0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr109i0 state UP group default qlen 1000
link/ether 46:d0:3d:7f:67:ac brd ff:ff:ff:ff:ff:ff
28: tap110i0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master fwbr110i0 state UNKNOWN group default qlen 1000
link/ether ae:47:b6:b8:a5:9a brd ff:ff:ff:ff:ff:ff
32: tap111i0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master fwbr111i0 state UNKNOWN group default qlen 1000
link/ether 62:cc:95:4b:ce:6b brd ff:ff:ff:ff:ff:ff
36: tap107i0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master fwbr107i0 state UNKNOWN group default qlen 1000
link/ether ce:00:6d:6d:1c:10 brd ff:ff:ff:ff:ff:ff
40: fwbr111i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether 52:52:62:c5:ea:24 brd ff:ff:ff:ff:ff:ff
41: fwpr111p0@fwln111i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master vmbr1 state UP group default qlen 1000
link/ether d2:c8:a4:27:54:6b brd ff:ff:ff:ff:ff:ff
42: fwln111i0@fwpr111p0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr111i0 state UP group default qlen 1000
link/ether 52:52:62:c5:ea:24 brd ff:ff:ff:ff:ff:ff
43: fwbr106i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether a2:98:f8:50:c1:d5 brd ff:ff:ff:ff:ff:ff
44: fwpr106p0@fwln106i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master vmbr1 state UP group default qlen 1000
link/ether 12:06:8b:a6:61:40 brd ff:ff:ff:ff:ff:ff
45: fwln106i0@fwpr106p0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr106i0 state UP group default qlen 1000
link/ether a2:98:f8:50:c1:d5 brd ff:ff:ff:ff:ff:ff
46: fwbr107i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether ca:26:c4:be:88:b1 brd ff:ff:ff:ff:ff:ff
47: fwpr107p0@fwln107i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master vmbr1 state UP group default qlen 1000
link/ether fa:3e:01:6b:cc:1d brd ff:ff:ff:ff:ff:ff
48: fwln107i0@fwpr107p0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr107i0 state UP group default qlen 1000
link/ether ca:26:c4:be:88:b1 brd ff:ff:ff:ff:ff:ff
49: fwbr110i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether ae:fb:90:25:0e:7e brd ff:ff:ff:ff:ff:ff
50: fwpr110p0@fwln110i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master vmbr1 state UP group default qlen 1000
link/ether fa:3e:5b:93:36:16 brd ff:ff:ff:ff:ff:ff
51: fwln110i0@fwpr110p0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr110i0 state UP group default qlen 1000
link/ether ae:fb:90:25:0e:7e brd ff:ff:ff:ff:ff:ff
 
I changed the mac address for vmbr0 editing the network/interfaces file and is working ok now.
 
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I changed the mac address for vmbr0 editing the network/interfaces file and is working ok now.
Hi, I am having the same issues. I recently changed my router from Asus to Unifi, and Even though I can see my Proxmox on the Network, I can not ping it, yet my VM ( Home Assistant) is working fine. I do not have much IT experience and just followed a Youtube guide to set up Home Assistant in Proxmox. So I have no idea how to fix this issue. Can you tell me what you changed, and why?

I have set the same static ip on both networks, and made sure my gateway in the proxmox is correct, but beyond that I am lost.
 

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