So I'm looking at using a backup link for Starlink and got a little stuck
StarLink config
!
interface GigabitEthernet0/0
description StarLink
ip address dhcp
ip access-group 110 in
no ip redirects
no ip unreachables
no ip proxy-arp
ip accounting access-violations
ip mtu 1460
ip nbar protocol-discovery
ip flow ingress
ip nat outside
ip inspect traffic out
ip virtual-reassembly in
ip verify unicast reverse-path
rate-limit input access-group 160 496000 62500 62500 conform-action transmit exceed-action drop
ip tcp adjust-mss 1420
duplex full
speed 1000
no keepalive proto-up
no cdp enable
!
ip sla part
!
ip sla 1
icmp-echo 8.8.8.8 source-interface GigabitEthernet0/0
frequency 5
ip sla schedule 1 life forever start-time now
!
the ip track part works
router.local(config)#do sh track
Track 1
IP SLA 1 reachability
Reachability is Up
3142 changes, last change 00:00:08
Latest operation return code: OK
Latest RTT (millisecs) 42
router.local(config)#the routing part
#ip route 0.0.0.0 0.0.0.0 GigabitEthernet 0/0 DHCP 1
!
ip nat inside source route-map PRIMARY interface GigabitEthernet0/0 overload
ip route 0.0.0.0 0.0.0.0 dhcp
!
route-map BACKUP permit 10
match ip address 10
!
route-map PRIMARY permit 10
match ip address 10
match interface GigabitEthernet0/0
!
access-list 10 permit 192.168.0.0 0.0.0.255
access-list 10 permit 192.168.2.0 0.0.0.255
!
ignore the PRIMAY and BACKUP, I use them when the primary and backup link were both Dialer interfaces and IP SLA worked really well
output of sh ip route
router.local#sh ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
a - application route
+ - replicated route, % - next hop override, p - overrides from PfR
Gateway of last resort is 100.127.255.6 to network 0.0.0.0
S* 0.0.0.0/0 [254/0] via 100.127.255.6
100.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 100.64.0.0/10 is directly connected, GigabitEthernet0/0
L 100.76.70.128/32 is directly connected, GigabitEthernet0/0
192.168.0.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.0.0/24 is directly connected, GigabitEthernet0/1.100
L 192.168.0.1/32 is directly connected, GigabitEthernet0/1.100
192.168.2.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.2.0/24 is directly connected, GigabitEthernet0/1.200
L 192.168.2.1/32 is directly connected, GigabitEthernet0/1.200
router.local#there are two vlans, one for normal traffic one for Guest WiFi
!
interface GigabitEthernet0/1
no ip address
duplex auto
speed auto
!
interface GigabitEthernet0/1.100
description INTERNAL LAN
encapsulation dot1Q 100
ip address 192.168.0.1 255.255.255.0
no ip unreachables
no ip proxy-arp
ip accounting access-violations
ip nat inside
ip virtual-reassembly in
ip verify unicast reverse-path
ip tcp adjust-mss 1420
!
interface GigabitEthernet0/1.200
description GUEST LAN
encapsulation dot1Q 200
ip address 192.168.2.1 255.255.255.0
ip access-group 120 in
no ip redirects
no ip unreachables
no ip proxy-arp
ip accounting access-violations
ip nat inside
ip virtual-reassembly in
ip verify unicast reverse-path
ip tcp adjust-mss 1420
!
now the problem I'm having is there is no option to do something like
ip route 0.0.0.0 0.0.0.0 DHCP track 1
in the past I would use Dialer1 instead of GigabitEthernet0/0 and it would work fine
!
ip nat inside source route-map PRIMARY interface GigabitEthernet0/0 overload
ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/0 track 1
!
but if I use the above I get a lot of ping time outs if I continually ping an known external IP address
if I use
#ip route 0.0.0.0 0.0.0.0 GigabitEthernet 0/0 DHCP 1
works ok but I can't flip over to the backup link if I do a shut on the Starlink interface
the backup is an LTE link on 192.168.0.254 which works ok, so is there an elegant solution to having ip sla on interface with DHCP clients?
If I try to add it
router.local(config)#ip route 0.0.0.0 0.0.0.0 GigabitEthernet 0/0 track 1
%Default route without gateway, if not a point-to-point interface, may impact performance
router.local(config)#
and it doesn't really work, I still have to add it without track 1 to actually make it work
