Authoritative DNS mode allows local DNS names may be exported to zone in the global DNS. Dnsmasq acts as authoritative server for this zone, and also provides zone transfer to secondaries for the zone, if required. DNSSEC validation may be performed on DNS replies from upstream nameservers, providing security against spoofing and cache poisoning.
If a local DNS server is listening on any or eg 127.0.1.1 and superseding the dhcp's dns setting in /etc/resolv.conf, then doing a query to 127.0.1.1 (anything else than 127.0.0.1) can go wrong, eg (conntrack -E): [NEW] udp 17 30 src=127.0.0.1 dst=127.0.1.1 sport=38781 dport=53 [UNREPLIED] src=127.0.1.1 dst=10.0.3.66 sport=53 dport=38781. Handling domain name server lookups from the hosts on the LAN with IP masquerading has always presented a problem. There are two ways of accomodating DNS in a masquerade environment. You can tell each of the hosts that they use the same DNS that the Linux router machine does, and let IP masquerade do its magic on their DNS requests. Jul 15, 2020 · Note: If the ip-masq-agent daemonset is running, either as an add-on or installed manually, the masquerading behavior described in the table above depends on the master version of the cluster. If IP Masquerade, also called IPMASQ or MASQ, allows one or more computers in a network without assigned IP addresses to communicate with the Internet using the Linux server's assigned IP address. The IPMASQ server acts as a gateway, and the other devices are invisible behind it, so to other machines on the Internet the outgoing traffic appears to Set your dhcp server to use the internal gateway of the 3548 as its DNS resolver. Now from the inside, going to the URL for cam1.thatwebsite.com will resolve to the local inside IP. View solution in original post 0 Kudos IP masquerading Also called: Network address and port translation (NAPT), port address translation (PAT). Scenario: Single public IP address is mapped to multiple hosts in a private network. NAT solution: Assign private addresses to the hosts of the corporate network It is how to configure IP Masquerading with Firewalld. This exmaples are based on the environment below.
To check if IP masquerading is enabled (for example, for the external zone), enter the following command as root: ~]# firewall-cmd --zone=external --query-masquerade The command prints yes with exit status 0 if enabled.
Linux IP Masquerading allows for this functionality even though these internal machines don't have an officially assigned IP address. MASQ allows a set of machines to invisibly access the Internet via the MASQ gateway. To other machines on the Internet, the outgoing traffic will appear to be from the IP MASQ Linux server itself. Be sure to specify a DNS when setting up your clients. Otherwise you will get errors on the clients saying 'cannot resolve address' etc. If DNS used to work (URL address worked) but doesn't after you setup Masquerading, this is because your ISP's/network's DHCP server can no longer tell you what the DNS address is. Masquerade rules are a special class of filtering rule. You can masquerade only datagrams that are received on one interface that will be routed to another interface. To configure a masquerade rule you construct a rule very similar to a firewall forwarding rule, but with special options that tell the kernel to masquerade the datagram.
Source NAT rules can be used for many different applications. A popular usage of NAT Masquerade is to translate a private address range to a single public IP address. This allows the hosts behind the EdgeRouter to communicate with other devices on the internet. There are two types of Source NAT rules:
Be sure to specify a DNS when setting up your clients. Otherwise you will get errors on the clients saying 'cannot resolve address' etc. If DNS used to work (URL address worked) but doesn't after you setup Masquerading, this is because your ISP's/network's DHCP server can no longer tell you what the DNS address is. Masquerade rules are a special class of filtering rule. You can masquerade only datagrams that are received on one interface that will be routed to another interface. To configure a masquerade rule you construct a rule very similar to a firewall forwarding rule, but with special options that tell the kernel to masquerade the datagram. IP Masquerading using iptables 1 Talk’s outline. iptables versus ipchains; The goal (or: my goal) The packet’s way through iptables “Classic” masquerading (SNAT) DNS faking (with DNAT) Other things Firewalling with iptables (If we have time) Questions I’ll hopefully answer You may be running Moodle behind a Masquerading Firewall (using Network Address Translation or NAT). In this case your internal Moodle server will most likely be assigned a non-routable (private) IP address in one of the following ranges: 10.0.0.0 - 10.255.255.255 172.16.0.0 - 172.31.255.255