Good morning,
I believe I've found a bug in the PBR engine. The scenario is the following:
- DHCP addresses on whichever is the WAN port.
- A VPN or other vTunnel interface
- Attempting to *exclude* certain addresses in the LAN subnet from routing over the vTunnel using source IP.
Expected behavior: Addreses excluded from the tunnel go out WAN interface.
Actual behavior: Traffic from addresses excluded from the tunnel never reaches the WAN interface, period, regardless of whether or not the tunnel is established.
I have posted on forums here and reddit.com/r/ubiquiti for assistance, and I've sent an ticket for assistance to UBNT. Nobody seems to be able to solve the issue; and my config 'should work'. As it doesn't, either I've made an error nobody's yet found, or there's a bug in the routing engine, and a serious one that would impact business use.
Thank you for reading; sanitized config follows (In this config, the address excluded is 192.168.17.37/32):
Please see https://community.ubnt.com/t5/EdgeMAX/ERL-Excluding-certain-source-IPs-from-routing-through-OpenVPN/m-p/1708237#U1708237 for reference
firewall {
all-ping enable
broadcast-ping disable
ipv6-receive-redirects disable
ipv6-src-route disable
ip-src-route enable
log-martians enable
modify SOURCE_ROUTE {
rule 10 {
action modify
description "Excluded from VPN routing"
modify {
table 1
}
source {
address 192.168.17.37/32
}
}
rule 20 {
action modify
modify {
table 2
}
source {
address 192.168.17.0/24
}
}
}
name WAN_IN {
default-action drop
description "WAN to internal"
rule 10 {
action accept
description "Allow established/related"
state {
established enable
related enable
}
}
rule 20 {
action drop
description "Drop invalid state"
state {
invalid enable
}
}
}
name WAN_LOCAL {
default-action drop
description "WAN to router"
rule 10 {
action accept
description "Allow established/related"
state {
established enable
related enable
}
}
rule 20 {
action accept
description "Allow GRE"
log disable
protocol 47
state {
established enable
invalid disable
new enable
related enable
}
}
rule 30 {
action accept
description "Allow PPTP"
destination {
port 1723
}
log disable
protocol tcp
}
rule 40 {
action drop
description "Drop invalid state"
state {
invalid enable
}
}
}
receive-redirects disable
send-redirects enable
source-validation disable
syn-cookies enable
}
interfaces {
ethernet eth0 {
address 192.168.17.1/24
description Local
duplex auto
firewall {
in {
modify SOURCE_ROUTE
}
}
speed auto
}
ethernet eth1 {
address dhcp
description Internet
duplex auto
firewall {
in {
name WAN_IN
}
local {
name WAN_LOCAL
}
}
speed auto
}
ethernet eth2 {
address 192.168.2.1/24
description "Local 2"
duplex auto
speed auto
}
loopback lo {
}
openvpn vtun0 {
config-file /config/auth/USSiliconValley.ovpn
disable
}
}
protocols {
static {
table 1 {
interface-route 0.0.0.0/0 {
next-hop-interface eth1 {
}
}
}
table 2 {
interface-route 0.0.0.0/0 {
next-hop-interface vtun0 {
}
}
}
}
}
service {
dhcp-server {
disabled false
hostfile-update disable
shared-network-name **REDACTED**{
authoritative disable
subnet 192.168.17.0/24 {
default-router 192.168.17.1
dns-server **REDACTED**
lease 86400
start 192.168.17.100 {
stop 192.168.17.200
}
unifi-controller **REDACTED**
}
}
use-dnsmasq disable
}
dns {
dynamic {
interface eth1 {
service afraid {
host-name **REDACTED**
login **REDACTED**
password **REDACTED**
protocol **REDACTED**
server **REDACTED**
}
}
}
}
gui {
http-port 80
https-port 443
older-ciphers enable
}
nat {
rule 5000 {
description "Routing Excluded from VPN"
log disable
outbound-interface eth1
protocol all
type masquerade
}
rule 5001 {
description "PIA Masquerade NAT"
log disable
outbound-interface vtun0
protocol all
source {
}
type masquerade
}
}
ssh {
port 22
protocol-version v2
}
}
system {
domain-name **REDACTED**
host-name **REDACTED**
login {
user **REDACTED** {
authentication {
encrypted-password **REDACTED**
plaintext-password ""
}
full-name "**REDACTED**"
level admin
}
}
name-server **REDACTED**
ntp {
server 0.ubnt.pool.ntp.org {
}
server 1.ubnt.pool.ntp.org {
}
server 2.ubnt.pool.ntp.org {
}
server 3.ubnt.pool.ntp.org {
}
}
syslog {
global {
facility all {
level notice
}
facility protocols {
level debug
}
}
}
time-zone America/Los_Angeles
}
/* Warning: Do not remove the following line. */
/* === vyatta-config-version: "config-management@1:conntrack@1:cron@1:dhcp-relay@1:dhcp-server@4:firewall@5:ipsec@5:nat@3:qos@1:quagga@2:system@4:ubnt-pptp@1:ubnt-util@1:vrrp@1:webgui@1:webproxy@1:zone-policy@1" === */
/* Release version: v1.9.0.4901118.160804.1131 */