IODINE_PORT='53' # Local IP address iodined should bind to. IODINE_BIND_ADDRESS='0.0.0.0' # External IP of your iodined server, used in DNS answers.

When I say it's possible to be in the middle of Silicon Valley and have miserable Internet access, I mean it. If I end up working at this site again, I'm going to have to buy my own little cellular hotspot and find a place with decent cell reception.

And another software called openvpn with connecting openvpn server through udp port 53 i can browse internet without even login into the cyberoam. Both of softwares uses port 53, specially openvpn with port 53, now i've a VPS server in which i can install openvpn server and connect through the VPS server to browse internet. I know why that is happening because with pinging on some website(eb. Google.com) it returns it's ip address that means it allows dns queries without login. But the problem is there is already DNS service is running on the VPS server on port 53. And i can only use 53 port to bypass the limitations as i think. And i can not run openvpn service on my VPS server on port 53.

It just so happens that port 53 works. Some of the time, at least. It was just enough of a pipe to let me do things like git sync operations. Trying to look at web pages was asking too much of this laggy, lossy connection. It was shades of my 4800 bps cellular modem hack, only far worse. SG Ports Services and Protocols - Port 53 tcp/udp information, official and unofficial assignments, known security risks, trojans and applications use. Open 5060 UDP to FreePBX - how to make secure? On main site router, port forward 9500.

There's just no way around it. Tunneling over port 53. What a horrible hack.

Hi guys, i have an issue with my config and probably not understand the whole thing right. Perhaps someone is able to open my eyes. Thanks in advance: So what is exactly the issue? I have a router 2821 and firewall active. Also i have an acl for outgoing traffic on Dialer Interface 'ip access group 200 in ' where i allow access-list 200 permit udp any eq domain any also 'ip inspect Firewall out ' for tcp, udp, ftp ok. Everything works fine as i have 'ip dns server' globally enabled (as like a proxy for my internal net) But now the issue seems that my port 53 udp is open and everyone ( isp said this) could use this DNS for some attacks and so on.

So how to scan the wifi for vulnerable ports like 53 so that i can figure out the magic port and start a openvpn service on VPS on the same port. ( i want to scan similar vulnerable ports like 53 on cyberoam in which the traffic can be tunneled, not want to scan services running on ports). Improvement of the question with retags and edits are always welcomed. Another Question i'ave made simple client server application in which a external computer acts as server running on UDP port 53 and client running inside the wifi; will connnect to that out side server that is running on UDP port 53. Problem is it can't connect that server application.

I basically did this: iptables -t nat -I PREROUTING -s external.ip.of.office.network -p udp -j REDIRECT --to-ports port_of_tunnel_server_daemon Basically, I took *ALL* UDP from that office and shoved it into the program which runs the VPN/tunnel. That way, if I'm able to find so much as a single port which will pass traffic unmolested, I can get on. It just so happens that port 53 works. Some of the time, at least.

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We also recommend runnig multiple anti-virus/anti-malware scans to rule out the possibility of active malicious software. For more detailed and personalized help please use our forums.

If the DNS server is enabled, a remote attacker could send a specially-crafted request to UDP port 53 to cause the server to crash. References: [] [] [] SG 53 tcp,udp Domain Name System (DNS) (official) Wikipedia 53 tcp trojan ADM worm, li0n, MscanWorm, MuSka52 Trojans 53 udp applications Lineage II Portforward 53,80,443,0 tcp applications Socom, Socom 2. Also uses ports 6000-6999,10070 udp Portforward 53,80,443,0 tcp applications Twisted Metal Black Online (also uses ports 6000-6999 udp) Portforward 53 tcp ADMworm [trojan] ADM worm Neophasis 53 tcp Lion [trojan] Lion Neophasis 53 tcp threat Civcat Bekkoame 53 tcp threat Esteems Bekkoame 53 tcp threat W32.Dasher Bekkoame 53 tcp threat W32.Spybot Bekkoame 53 tcp,udp domain Domain Name Server IANA 13 records found.

So how it should work that everything which is need going out is working but in generally the port 53 udp is closed from outside? Thanks for help. Hello Karsten, thanks.here we go: Meanwhile i read with dns view group and implemented that.but that was after writing here and testing--port is still open in udp 53. Thats what i want to stop - nothing should be open for anyone outside. Ok, here are some changes to the firewall-setup: ip inspect name xx tcp router-traffic ip inspect name xx tcp router-traffic ip inspect name xx icmp router-traffic ip inspect name xx ftp With that you also inspect icmp (for pinging) and inspect traffic that is router-generated. With that you can remove the following lines from the ACL 200: 20 permit icmp any any echo-reply 60 permit udp any eq domain any 65 permit tcp any eq domain any 70 permit udp any eq 5060 any 79 permit udp host 130.149.17.8 eq ntp any 80 permit udp host 192.53.103.104 eq ntp any And I assume that the following line can also be remove: 120 permit udp any gt 40000 any.

Zebradesigner pro v2. Now you need to port-forward port 53 (the port DNS uses) on your home-router to your device, used as server. This is different for every router but generally you also want to make the internal IP “static” for this device so it does not change after a reboot. Now your Iodine-daemon is accessible from outside of your network. You can check if everything is properly setup by filling it in on this page. It will tell you were it failed if something is not in order.

It was just enough of a pipe to let me do things like git sync operations. Trying to look at web pages was asking too much of this laggy, lossy connection. It was shades of my 4800 bps cellular modem only far worse.

• The DNS recursor sends a query message to the gTLD name servers looking for the.cisco.com domain name space. • The gTLD name servers send a DNS referral response message to the DNS recursor informing it to ask the.cisco.com name servers, ns1.cisco.com or ns2.cisco.com, about this domain name space. • The DNS recursor sends a query to ns1.cisco.com or ns2.cisco.com asking for. • The.cisco.com name servers, ns1.cisco.com or ns2.cisco.com, send an authoritative DNS query response message to the DNS recursor with the A (address) RR information for www.cisco.com. • The DNS recursor sends a DNS query response message to the DNS resolver with the A (address) RR information for.

This feature is available beginning with software release 7.2(1) for Cisco ASA and Cisco PIX 500 Firewalls. This function is not available on FWSM Firewalls. This function is disabled by default. DNS message size limitations DNS amplification and reflection attacks are more effective when leveraging large DNS messages than small DNS message sizes.

The difference between normal ip inspect name xx tcp and: ip inspect name xx tcp router - traffic Thanks in advance Regards Cyb.

Hi guys, i have an issue with my config and probably not understand the whole thing right. Perhaps someone is able to open my eyes. Thanks in advance: So what is exactly the issue? I have a router 2821 and firewall active. Also i have an acl for outgoing traffic on Dialer Interface 'ip access group 200 in ' where i allow access-list 200 permit udp any eq domain any also 'ip inspect Firewall out ' for tcp, udp, ftp ok. Everything works fine as i have 'ip dns server' globally enabled (as like a proxy for my internal net) But now the issue seems that my port 53 udp is open and everyone ( isp said this) could use this DNS for some attacks and so on. If i disable the dns service - my internal network is not able to resolving anymore and sucks.

Techniques are shared that can be used to prevent these types of activities. DNS Open Resolvers A DNS open resolver is a DNS server that allows DNS clients that are not part of its administrative domain to use that server for performing recursive name resolution. Essentially, a DNS open resolver provides responses (answers) to queries (questions) from anyone asking a question. DNS open resolvers are vulnerable to multiple malicious activities, including the following: • DNS cache poisoning attacks • DNS cache poisoning attacks‡ • Resource utilization attacks ‡Denial of Service (DoS) or Distributed DoS (DDoS) DNS Cache Poisoning Attacks DNS cache poisoning occurs when an attacker sends falsified and usually spoofed RR information to a DNS resolver. Once the DNS resolver receives the falsified RR information, it is stored in the DNS cache for the lifetime (Time To Live [TTL]) set in the RR.

One thing they supposedly had was wireless Internet. I assumed it would work, but hadn't actually tested it. While waiting on my client to arrive, I tried using it. I found that it would just sit there and spin forever before finally yielding something ridiculous like '5 0 0 S e r v e r e r r o r'. Yes, it actually stretched the letters out like that.

Contents Overview This white paper provides information on general best practices, network protections, and attack identification techniques that operators and administrators can use for implementations of the Domain Name System (DNS) protocol. DNS is a globally distributed, scalable, hierarchical, and dynamic database that provides a mapping between hostnames, IP addresses (both IPv4 and IPv6), text records, mail exchange information (MX records), name server information (NS records), and security key information defined in Resource Records (RRs). The information defined in RRs is grouped into zones and maintained locally on a DNS server so it can be retrieved globally through the distributed DNS architecture. DNS can use either the User Datagram Protocol (UDP) or Transmission Control Protocol (TCP) and historically uses a destination port of 53. When the DNS protocol uses UDP as the transport, it has the ability to deal with UDP retransmission and sequencing.

All I got was that stupid error page. One thing I noticed during all of this was that I was actually able to resolve hostnames. Not only that, but I could bounce queries off specific servers. Apparently UDP port 53 would get through.

I’ve been using OpenVPN to connect remote offices to FreePBX for clients, but its such a pain to configure. Also, for IPhone/Android softphone app like ZoIPER, VPN doesn’t work because the VPN won’t stay open after the phone screen is locked etc. So I’m thinking about forgetting all these OpenVPN tunnels and just opening 5060. With 12+ character extension passwords that consist of uppercase and lowercase alpha, numbers, and special characters, what is the risk really? As far as I know, there’s no way the password will be brute forced or dictionary broken (I play around with GPU password cracking as a hobby) So what’s the risk? DoS from bruteforce attacks? How can I mitigate any risk of opening 5060 UDP to FreePBX Thanks.

References: [] [] Siemens Gigaset SE461 WiMAX router 1.5-BL024.9.6401, and possibly other versions, allows remote attackers to cause a denial of service (device restart and loss of configuration) by connecting to TCP port 53, then closing the connection. References: [] [] Cisco IOS is vulnerable to a denial of service, caused by an error in NAT of DNS. By sending specially-crafted DNS packets to TCP port 53, a remote attacker could exploit this vulnerability to cause the device to reload.

Scenario of wifi: i'm using wifi in hostel which having cyberoam firewall and all the computer which uses that access point. That access point have following configuration default gateway: 192.168.100.1 primary dns server: 192.168.100.1 here, when i try to open a website the cyberoam firewall redirects the page to a login page (with correct login information, we can browse internet else not), and also website access and bandwidth limitations. Once i've heard about pd-proxy which finds open port and tunnels through a port ( usually udp 53). Using pd-proxy with UDP 53 port, i can browse internet without login, even bandwidth limit is bypassed!!!

In the preceding example, the DNS guard function has dropped 182 DNS response message packets due to an incorrect DNS transaction ID or a DNS response message with the correct transaction ID has already been received. For additional information about debugging accelerated security path (ASP) dropped packets or connections, reference the. Cisco IPS The Cisco IPS provides several signatures to detect application specific vulnerabilities such as buffer overflow vulnerabilities as well as informational DNS signatures that may be indicative of reconnaissance or probing. In addition to these application specific signatures, anomaly-based signatures can provide coverage for vulnerabilities such as amplification attacks or cache poisoning, where the rate of DNS transactions are likely to vary significantly. The following table lists the DNS specific signatures provided on the Cisco IPS appliance with signature pack S343. DNS-Specific Signatures Provided on the Cisco IPS Appliance with Signature Pack S343.

Whereas the IP protocol deals only with packets, TCP enables two hosts to establish a connection and exchange streams of data. TCP guarantees delivery of data and that packets will be delivered in the same order in which they were sent.

To properly recreate a firmware you need to have good knowledge about how the firmware on the device is constructed, compile a few new executables, use the right offsets in the firmware and hope that the device will accept it and it will not be bricked and no one detects that the device has been tampered with. For crackers this is currently too expensive to do, but it is certainly the most effective way.

Note that while you are able to do DNS queries, it does not follow that port 53 is open to the internet. The usual case is that you are permitted contact to controlled DNS servers, and it is those that can forward DNS requests out to the internet - much like in a domestic setting you often set your router to be the DNS server for the network, and it is the router that resolves queries. If it is the case that port 53 is open only to specific DNS server, then you can get around it using an IP over DNS tunnel. If you have a VPS running a DNS server and you have a domain name you can can control, you could use which allows you to tunnel IP over DNS queries, and so removes the need for OpenVPN (though running OpenVPN inside the tunnel will ensure your packets are protected.

The tree-like data structure for the domain name space starts at the root zone '.' , which is the top most level of the DNS hierarchy. Although it is not typically displayed in user applications, the DNS root is represented as a trailing dot in a fully qualified domain name (FQDN). For example, the right-most dot in ' www.cisco.com.' Represents the root zone.

Scenario of wifi: i'm using wifi in hostel which having cyberoam firewall and all the computer which uses that access point. That access point have following configuration default gateway: 192.168.100.1 primary dns server: 192.168.100.1 here, when i try to open a website the cyberoam firewall redirects the page to a login page (with correct login information, we can browse internet else not), and also website access and bandwidth limitations. Once i've heard about pd-proxy which finds open port and tunnels through a port ( usually udp 53). Using pd-proxy with UDP 53 port, i can browse internet without login, even bandwidth limit is bypassed!!! And another software called openvpn with connecting openvpn server through udp port 53 i can browse internet without even login into the cyberoam.

If you use 5060 for SIP you are always more vulnerable than if you use another port, you have a little less than 64k choices, be original don’t choose 50600 or 50nn anything etc. It just reduces the risk by 99.99% or so and of course have your firewall in front of your PBX detect and drop port scanners. Dicko, Thanks for help! Okay so i need to update the freepbx bindport, but then I have to update all the ports for extensions in freepbx, (easy enough with BAT i guess) but then I have to update all my phone configs too I guess I can do that. I have another general SIP port question though — Lets assume Im still using 5060. I have 5060 udp open to the freepbx at public IP 1.1.1.1 I then have remote office at external IP 2.2.2.2 remote office has 3 phones.

The ddns.service will keep it that way. Configuring the Iodine-daemon First you have to install the iodine program on the server at home, find it in the repository as “iodine” or “iodine-server”. For Arch-Linux this is the following command: pacman -Sy iodine Now you want to configure the daemon with the info of your record and make it start at boot. This is the command that has to run on boot: /usr/bin/iodined -f -c -l $IODINE_BIND_ADDRESS -n $IODINE_EXT_IP -p $IODINE_PORT -P $IODINE_PASSWORD -u $IODINE_USER $TUN_IP $TOP_DOMAIN On Arch-Linux the service file is already supplied and the settings can be found at /etc/conf.d/iodined: (you only need TOP_DOMAIN and IODINE_PASSWORD) # Address and subnet to use for the tunnel (default mask is /27) TUN_IP='172.18.42.1/24' # Password (32 characters max) IODINE_PASSWORD='mypassword' # The domain you control, see documentation. TOP_DOMAIN='.com' # UDP port iodined should listen on.