Giving some hints more than an answer.
On 9/23/2022 2:20 PM, Zeta Cloud wrote:
Hi.
I'm running dnsmasq as the local DHCP server in a container/VM/jail
intended to serve as a router for multiple VMs, and the router VM is set up
with multiple vnics, each on a different subnet.
I'll assume that you are talking about VLAN/alias interface.
vnic1: Subnet A -> 192.168.11.0 (external)
What Ip are you realy getting on this interface?
vnic2: Subnet B -> 192.168.21.0 (internal)
vnic3: Subnet C -> 192.168.31.0 (storage)
The problem I'm having is that as soon as a VM on subnet A requests a DHCP
address, dnsmasq will not respond to any future requests from VMs on subnet
B or subnet C. If I restart the dnsmasq service, and if the first DHCP
request is from subnet B, it won't respond to queries from subnet A/C. Etc.
Does your network topology works without dnsmasq?
Is this peculiar to the particular version of dnsmasq-2.86? I've tried
everything, with and without option bind-interfaces, with and without all
interfaces explicitly listed, exclude-interfaces, etc.
See above point.
Any help on this would be greatly appreciated. I've already spent 2 days
trying to figure out what was going on. I'm trying to set up
containers/VMs. The problem I face is that once I set up a VM on one
subnet, VM creation fails for all other subnets. A restart of dnsmasq
doesn't help, because then dnsmasq responds to the first and subsequent
DHCP requests from a subnet, but stops responding to VMs on other subnets.
Thanks very much.
Try to get this working with one internal and one external interface.
My dnsmasq.conf included below for reference.
------------------------------------------
dhcp-authoritative
dhcp-lease-max=1000
dhcp-leasefile=/var/cache/dnsmasq/dnsmasq.leases
dhcp-rapid-commit
Remove this one for the time being.
log-facility=/var/log/dnsmasq/dnsmasq.log
log-queries
log-dhcp
Do you see in the log why dnsmasq is not happy?
# NAT Interface
except-interface=net0
no-dhcp-interface=net0
If you ignore the interface, the other flag is not realy needed.
domain=zetac.lan
# Subnet A
interface=net1
bind-interfaces
listen-address=192.168.11.1
dhcp-range=set:extl,192.168.11.101,192.168.11.200,12h
dhcp-option=tag:extl,option:dns-server,192.168.11.1
dhcp-option=option:netmask,255.255.255.0
dhcp-option=option:domain-name,zetac.lan
# Subnet B
interface=net2
bind-interfaces
Why do you use this opt multiple times, I would only use it once.
listen-address=192.168.21.1
In this context, I can't say that I see the point of using the above.
dhcp-option=tag:intl,option:dns-server,192.168.21.1
dhcp-option=option:netmask,255.255.255.0
dhcp-option=option:domain-name,zetac.lan
Do you realy need those opts?
# Subnet B
interface=net3
bind-interfaces
listen-address=192.168.31.1
dhcp-range=set:intl,192.168.31.101,192.168.31.200,12h
dhcp-option=tag:intl,option:dns-server,192.168.31.1
dhcp-option=option:netmask,255.255.255.0
dhcp-option=option:domain-name,zetac.lan
Same points as for the other subnet.
If I may, find a simple network example for two interfaces
(internal/external), then get dnsmasq working and build up from there.
--
John Doe
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