Hi,
Nomad 1.2.3
Consul 1.10.3
CNI 1.0.1
Every times I reboot my cluster nomad/consul/vault. I have this error on job, especially these whose used consul connect.
failed to setup alloc: pre-run hook "network" failed: failed to configure networking for alloc: failed to configure network: failed to set bridge addr: could not set bridge's mac: invalid argument
or
failed to setup alloc: pre-run hook "network" failed: failed to configure networking for alloc: failed to configure network: failed to allocate for range 0: 172.26.64.101 has been allocated to 987e3755-f6e9-2c97-9310-106d433e9182, duplicate allocation is not allowed
Sometimes I need to restart nomad service or sometimes waiting. But waiting 30 minutes or 1 hour 
and suddenly after many auto-restart of job it works!
I didn’t find something relevant on logs.
Can I have just an explanation about this to find maybe a solution. Thanks! 
Hi @fred-gb. Thanks for using Nomad.
Could you share your jobspec file and any network configuration from your server/client hcl files? Both of these errors appear to be coming from the call to containerd/go-cni/cni.Setup. I might be able to spot something if I can see your config.
Cheers,
Derek
Hi,
Thanks, today same problem, after 1 hour it works.
My mariadb job:
job "mariadb" {
region = "global"
datacenters = ["dc1"]
type = "service"
vault {
policies = ["credentials"]
}
update {
max_parallel = 1
canary = 1
min_healthy_time = "10s"
healthy_deadline = "5m"
auto_revert = true
auto_promote = true
health_check = "checks"
stagger = "30s"
}
constraint {
attribute = "${node.unique.name}"
value = "backend"
}
group "mariadb" {
network {
mode = "bridge"
}
service {
name = "mariadb"
port = "3306"
connect {
sidecar_service {}
}
}
task "mariadb" {
driver = "docker"
config {
image = "ghcr.io/linuxserver/mariadb"
volumes = [
"/data/mariadb/mysql:/config"
]
}
template {
data = <<EOH
MYSQL_ROOT_PASSWORD = {{with secret "database/data/mariadb/mariadb"}}{{.Data.data.mysql_root_password}}{{end}}
MYSQL_USER = {{with secret "database/data/mariadb/mariadb"}}{{.Data.data.mysql_user}}{{end}}
MYSQL_PASSWORD = {{with secret "database/data/mariadb/mariadb"}}{{.Data.data.mysql_password}}{{end}}
MYSQL_DATABASE = {{with secret "database/data/mariadb/mariadb"}}{{.Data.data.mysql_database}}{{end}}
EOH
destination = "secrets/file.env"
env = true
}
resources {
memory = 1000
cpu = 1000
}
}
}
}
cat /etc/nomad.d/server.hcl
server {
enabled = true
bootstrap_expect = 3
rejoin_after_leave = false
enabled_schedulers = ["service","batch","system"]
num_schedulers = 1
node_gc_threshold = "24h"
eval_gc_threshold = "1h"
job_gc_threshold = "4h"
deployment_gc_threshold = "1h"
encrypt = ""
raft_protocol = 3
}
base.hcl:
name = "backend001"
region = "global"
datacenter = "dc1"
enable_debug = false
disable_update_check = false
bind_addr = "0.0.0.0"
advertise {
http = "10.0.0.249:4646"
rpc = "10.0.0.249:4647"
serf = "10.0.0.249:4648"
}
ports {
http = 4646
rpc = 4647
serf = 4648
}
consul {
# The address to the Consul agent.
address = "localhost:8500"
token = ""
# The service name to register the server and client with Consul.
server_service_name = "nomad-servers"
client_service_name = "nomad-clients"
tags = {}
# Enables automatically registering the services.
auto_advertise = true
# Enabling the server and client to bootstrap using Consul.
server_auto_join = true
client_auto_join = true
}
data_dir = "/var/nomad"
log_level = "INFO"
enable_syslog = true
leave_on_terminate = true
leave_on_interrupt = false
acl {
enabled = false
token_ttl = "30s"
policy_ttl = "30s"
replication_token = ""
}
vault {
enabled = true
address = "http://127.0.0.1:8200"
allow_unauthenticated = true
create_from_role = "nomad-cluster"
task_token_ttl = ""
ca_file = ""
ca_path = ""
cert_file = ""
key_file = ""
tls_server_name = ""
tls_skip_verify = false
token = "xxxx"
namespace = ""
}
telemetry {
disable_hostname = "false"
collection_interval = "1s"
use_node_name = "false"
publish_allocation_metrics = "false"
publish_node_metrics = "false"
filter_default = "true"
prefix_filter = []
disable_dispatched_job_summary_metrics = "false"
statsite_address = ""
statsd_address = ""
datadog_address = ""
datadog_tags = []
prometheus_metrics = "true"
circonus_api_token = ""
circonus_api_app = "nomad"
circonus_api_url = "https://api.circonus.com/v2"
circonus_submission_interval = "10s"
circonus_submission_url = ""
circonus_check_id = ""
circonus_check_force_metric_activation = "false"
circonus_check_instance_id = ""
circonus_check_search_tag = ""
circonus_check_display_name = ""
circonus_check_tags = ""
circonus_broker_id = ""
circonus_broker_select_tag = ""
}
autopilot {
cleanup_dead_servers = true
last_contact_threshold = "200ms"
max_trailing_logs = 250
server_stabilization_time = "10s"
}
client.hcl
client {
enabled = true
node_class = ""
no_host_uuid = false
max_kill_timeout = "30s"
network_speed = 0
cpu_total_compute = 0
gc_interval = "1m"
gc_disk_usage_threshold = 80
gc_inode_usage_threshold = 70
gc_parallel_destroys = 2
reserved {
cpu = 0
memory = 0
disk = 0
}
options = {
"driver.raw_exec.enable" = "true"
"docker.privileged.enabled" = "true"
"docker.volumes.enabled" = "true"
"docker.cleanup.image.delay" = "1h"
}
}
I show you all ! 
Thanks!
This value in the server.hcl file stands out to me because it matches the time interval you are witnessing. I’m wondering if this is having an unexpected effect. This line checks the oldThreshold variable which is computed a few lines earlier.
Could you try setting that value a bit lower and seeing if it has an impact? I’m not suggesting this is a fix, but I’m hoping since you have this environment up and running, it will be faster/easier for you to test the theory.
Hi,
Sorry but since this first post, I didn’t have the same issue. I don’t know…