[Dnsmasq-discuss] Issues with multiple subnets on dnsmasq

[Ryan Chapman]

On the host that pulls a 172.16.48 address, try a ping of 172.16.48.4 and then check the arp table to make sure it resolved to a hardware address.  If not, tcpdump arp traffic.

It might be interesting to see what an ifconfig, "route -n" and "arp -a" look like on the 172.16.48 host…


On Sep 3, 2012, at 7:29 AM, subhranshu dwivedi <subhranshu.dwivedi at erminsystems.com> wrote:

> Hi All,
> 
> I have Untangle with DNS masq setup at my end,
> 
> With interface:
> 
> External
> eth0      Link encap:Ethernet  HWaddr 00:04:23:c7:52:63  
>           inet addr:172.16.57.10  Bcast:172.16.57.255  Mask:255.255.255.0
> 
> INTERNAL
> eth1      Link encap:Ethernet  HWaddr 00:04:23:c7:52:62  
>           inet addr:172.16.48.4  Bcast:172.16.51.255  Mask:255.255.252.0
> DMZ
> eth2      Link encap:Ethernet  HWaddr 00:1b:21:0e:1f:46  
>           inet addr:172.16.48.110  Bcast:172.16.49.255  Mask:255.255.254.0
> 
> Extra ones: 
> eth3      Link encap:Ethernet  HWaddr fc:75:16:8e:57:2b  
>           inet addr:172.16.52.20  Bcast:172.16.53.255  Mask:255.255.254.0
> 
> eth4      Link encap:Ethernet  HWaddr fc:75:16:8e:57:42  
>           inet addr:172.16.56.2  Bcast:172.16.56.255  Mask:255.255.255.0
> 
> Now my dnsmasq.conf,
> 
> localise-queries
> server=202.56.224.135 # uplink.1
> server=59.144.127.16 # uplink.1
> expand-hosts
> addn-hosts=/etc/untangle-net-alpaca/dnsmasq-hosts
> no-hosts
> domain=bpl.netlink.com
> interface=eth1
> interface=eth3
> interface=eth4
> dhcp-range=eth1,172.16.49.101,172.16.49.254,14400
> dhcp-range=eth1,172.16.50.1,172.16.50.254,14400
> dhcp-range=eth1,172.16.51.101,172.16.51.254,14400
> dhcp-range=eth4,172.16.56.20,172.16.56.254,14400
> dhcp-range=eth3,172.16.52.21,172.16.53.254,14400
> dhcp-option=eth1,3,172.16.48.1
> dhcp-option=eth4,3,172.16.56.1
> dhcp-option=eth3,3,172.16.52.1
> dhcp-option=eth1,1,255.255.252.0
> dhcp-option=eth4,1,255.255.255.0
> dhcp-option=eth3,1,255.255.254.0
> dhcp-option=eth1,6,172.16.48.146,172.16.48.147
> dhcp-option=eth4,6,172.16.48.146,172.16.48.147
> dhcp-option=eth3,6,172.16.52.3,172.16.48.146
> dhcp-lease-max=500
> dhcp-host=00:13:02:a9:8b:57,172.16.48.106,24h
> dhcp-host=94:39:e5:e6:a7:cf,172.16.48.208,24h
> 
> 
> Now the issue is that i when we assign the ips with dnsmasq running with multiple subnets as mentioned we face issues with range 49:
> dhcp-range=eth1,172.16.49.101,172.16.49.254,14400
> dhcp-range=eth1,172.16.50.1,172.16.50.254,14400
> dhcp-range=eth1,172.16.51.101,172.16.51.254,14400
> 
> it assigns the 50 and 51 series fine with internet access but when assigns 49 series ip cant ping the untangles internal ip:172.16.48.4
> and hence no internet for 49 series 
> 
> Please suggest what can we do to resolve this.
> 
> -- 
> Best Regards,
>  
> Subhranshu Dwivedi
> Technology Support
> Ermin Systems
> subhranshu.dwivedi at erminsystems.com
>  
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