Q:Where did you get this name server from your ISP ?
A:There are assigned by the IPS via the "ppp ipcp dns request" command
Q:Do you have Dual uplinks to go different ISP,. when you mention the order list, it go order 1- 4 DNS, keep trying all 4 1 by 1
A:I don't actually have a dual link more a backup link only one works at any one time, so I would expected the rtr to drop the old DNS entries.
Q:is this isue on Router ? or client also same ?
A:The route is resolving the names only after it cycles through the DNS list but the Clients are not resolving at all.
Q:What OS are you running on your clients?
A:I have a mix but only testing on Win 7 Win 10.
Q:- How does the network configuration related to DNS look like on your clients?
A:The Clients were working and resolving host names but then they just stopped, when I cut back to my IPS supplied router I noted the 3/4G modem was locked up.
My DNS setup is this i Have a LAN and WLAN both have the same problem.
ip dhcp pool LAN
network 192.168.1.0 255.255.255.0
default-router 192.168.1.1
dns-server 192.168.1.1
ip dhcp pool WLAN
network 192.168.10.0 255.255.255.0
default-router 192.168.10.1
dns-server 192.168.1.1
!
Q:- Do the clients have static IP addressing configured?
All clients are DHCP from rtr
Q:- How does the routing table look like on your clients?
I don't fully understand the routing table, this below was mostly generated by the Routers GUI.
ip nat inside source route-map nat2backup interface Cellular0/0/0 overload
ip nat inside source route-map nat2primary interface Dialer1 overload
ip route 0.0.0.0 0.0.0.0 Dialer1 track 1
ip route 0.0.0.0 0.0.0.0 Cellular0/0/0 253
!
!
ip sla 1
icmp-echo 8.8.8.8 source-interface Dialer1
ip sla schedule 1 life forever start-time now
dialer-list 2 protocol ip permit
!
route-map track-primary-if permit 1
match ip address 197
set interface Dialer1
!
route-map nat2primary permit 1
match ip address 198
match interface Dialer1
!
route-map nat2backup permit 1
match ip address 198
match interface Cellular0/0/0
!
!
access-list 197 permit icmp any host 203.134.64.66
access-list 198 permit ip any any
!
Q:- Can you ping the DNS server IPs from your clients?
A: I can ping DNS by IP address, but the DNS which start with 10.x.x.x I cant as I'm running the WAN interface not the 3/4G and those DNS IP are private.
Q:I assume your rtr is servicing dhcp for your clients if so try the following and swap the addressing below to represent your rtr
rtr
ip dhcp pool xxx
network 192.168.1.0 /24
default-router 192.168.1.254
dns-server 192.168.1.254
exit
no ip name server
ip dns server
int dialer x
ppp ipcp dns request
A:
I think my setup already has these entries,
I will try adding the "no ip name server" and removing "ppp ipcp route default"
I will not have access to the router now till Thursday.
DHCP part
ip dhcp pool LAN
network 192.168.1.0 255.255.255.0
default-router 192.168.1.1
dns-server 192.168.1.1
!
ip dhcp pool WLAN
network 192.168.10.0 255.255.255.0
default-router 192.168.10.1
dns-server 192.168.1.1
WAN settings
!
interface Dialer1
mtu 1492
ip address negotiated
ip nat outside
ip virtual-reassembly in max-fragments 16 max-reassemblies 64 timeout 5
encapsulation ppp
dialer pool 1
dialer-group 1
no cdp enable
ppp authentication chap pap callin
ppp chap hostname
ppp chap password
ppp pap sent-username password
ppp ipcp dns request
ppp ipcp route default
