getnameinfo() function on a dualstack socket returning incorrect IP address?
c,linux,sockets,system-calls,ipv4
Try something more like this: struct sockaddr_storage client_ip; socklen_t sock_len; while(1) { sock_len = sizeof(client_ip); fd = accept(master_fd, (struct sockaddr*)&client_ip, &sock_len); if (fd == -1) break; if (client_ip.ss_family==AF_INET) { struct sockaddr_in *sa4 = (struct sockaddr_in*) &client_ip; printf("IPv4 add is %s\n", inet_ntoa(sa4->sin_addr) ); } else if (client_ip.ss_family==AF_INET6) { struct sockaddr_in6 *sa6...
Difference in Ethernet and Wireless IP addresses?
networking,ip,lan,ethernet,ipv4
It's because they are different connections. Each interface, hard wired or wired, will have it's own IP address. The IP itself is assigned by your router. If you are concerned with what pool your IP is assigned from, you need to go into your setup utility and see what is...
Kibana3: long to IP in terms panel
long-integer,logstash,kibana,ipv4
This is because 'ip' is stored internally as a number. In order to have a string version of the ip address, you need to add it to the mapping and then use ip.raw in your panel: "MY_FIELD" : { "index" : "analyzed", "type" : "ip", "fields" : { "raw" :...
How I can add IP Address From start to end to Database?
Quick and dirty, it will take care if the range spreads across octets $start = '192.168.0.1'; $end = '192.168.1.255'; $startint = ip2long($start); $endint = ip2long($end); while ($startint <= $endint) { echo long2ip($startint++); // replace echo with your DB insert } ...
How show IPv4 only with REMOTE_ADDR in PHP?
$_SERVER['REMOTE_ADDR'] always contains the address of the visitor. If it contains an IPv6 address then the visitor used IPv6 and there is no IPv4 address. And vice versa of course. These days you have to be able to deal with both. Some visitors will have only IPv4, some will have...
EndPoint Communication Exception with correct DNS IPv6 address but incorrect IPv4 address
A well behaved client would try each individual DNS recursor before it gives up and give you the The remote name could not be resolved error. So in the scenario where you have configured the client with an incorrect IPv4 address and a correct IPv6 address for the recursor, it...
How to find location based on IP address in Excel
excel,location,ip-address,vlookup,ipv4
You can convert your quad IP to a numeric using this function Function GetNumericIP(quadIP As String) As Long Dim sections On Error Resume Next sections = Split(quadIP, ".") GetNumericIP = sections(3) * 256 ^ 0 + sections(2) * 256 ^ 1 + sections(1) * 256 ^ 2 + sections(0) *...
How do I compare IP addresses in PHP as binary strings?
After much troubleshooting, I discovered the cause of this issue. When using the unpack function, I had used the format code "A4" which is for space-padded strings. This was causing anything ending with the number 32 to get treated as whitespace, which would then be trimmed. For example, after unpacking...
Wireshark Capture Filter - IPv4 and IPv6
networking,tcp,wireshark,ipv6,ipv4
If by "neighbour discovery protocol" you mean the IPv6 Neighbor Discovery Protocol in RFC 4861, then it uses ICMPv6 packets, so "only capture ICMP (both for IPv4 and IPv6) and ARP and neighbour discovery protocol packets" is equivalent to "only capture ICMP (both for IPv4 and IPv6) and ARP packets"....
Ping and use three octet ipv4 addresses. Why is it working?
It works because you are using a value of 290 for the third byte of the ip address. A byte can store values from 0 to 255, giving 256 values. Since an IPv4 address is a 4 byte value passing 290 to the third byte leads to an integer overflow...
getHostAddress() returns a reversed ip adress
Ok, I just saw that your address is reversed! :) It is referred as big/little endian issue, read more about Endianness which is must-to-know for all programmers, specially when doing applications integrations and migrations on different Operating Systems. Add this after gettting the Connection Info from the Wifi manager. int...
JavaScript change IPv6 into IPv4? [duplicate]
javascript,php,ipv6,ipv4,data-conversion
Just for kicks I did it in PHP too:) Explaining the PHP a bit more: I use inet_pton to get a binary value, then by using OR and bit shifting I build a new long values (4 bytes). Since inet_pton returns a structure, I use ord to get the decimal...
view website running on local machine via android
If you are running your webservice on localhost then you can run it in emulator using address http://10.0.2.2:63693/Notif.asmx. And if you want to run it live on phone then either you have to host your service on some Server. For accessing localhost service on live phone, the phone and service(machine...
ServerSocketChannel ignores System.setProperty(“java.net.preferIPv4Stack”) when run from Eclipse-generated jar
Setting java.net.preferIPV6Addresses programmatically is risky. There is other Java code executing before your class, and which code depends on how your Java application is launched. WebStart could affect this. Any pre-loaded Java agents could affect this also. It could also depend on which version of Java is used to launch....
Getting the ip address of eth0 interface in java only return IPv6 address and not IPv4
java,ipv4,inetaddress,network-interface
It was messing with the logic where it gets the next element. I had the inetAddress next element being gotten before the while compare was ran. Thus making there be no more elements. The following code has then fixed the logic interfaceName = "eth0"; NetworkInterface networkInterface = NetworkInterface.getByName(interfaceName); Enumeration<InetAddress> inetAddress...
Does IP address of a DNS changes over time?
I was wondering if the IP addresses of the domain names changes overtime They might change over time, and probably will eventually. If it changes then what could be the reason. It really depends on the individual server. If the server has static IP addresses, they likely won't change,...
Query on class B private address range
I am not clear about what you ask: the notation /12 leads to the net mask 11111111.11110000.00000000.00000000 NNNNNNNN.NNNNHHHH.HHHHHHHH.HHHHHHHH (network part / host part) which can be combined with 172.16.0.0: 10101100.0001HHHH.HHHHHHHH.HHHHHHHH (H = host part) This means that every IPv4 address which starts with these 12 bits belongs to this network....
C# - UdpClient.Send broadcasts to right AND wrong interface
c#,networking,udp,broadcast,ipv4
I think that Eren might be right. Look at the src mac addresses of the outgoing packets. Both frames from 10.0.0.1 have a src mac 60:67:20:ca:a6:2c and both from 172.20.29.152 have src mac of d4:be:d9:84:43:b8. Ethernet II, Src: IntelCor_ca:a6:2c (60:67:20:ca:a6:2c), Dst: Broadcast (ff:ff:ff:ff:ff:ff) Internet Protocol Version 4, Src: 10.0.0.1 (10.0.0.1),...
How should I pick which source specific multicast address to use?
Choose whatever you want. It only has to be unique per sending system. There is no algorithm for this. It's source specific after all ☺
Store IP into mysql database
For handling and storing both IPv4 and IPv6 addresses, you can use datatype VARBINARY(16). In version 5.6, MySQL (finally!) introduced conversion functions for IPv6 addresses: INET6_ATON, so you don't have to do the conversion in your application. If you are handling only IPv4 addresses, you can continue to use the...
Go to convert ipv6 to ipv4
What you're asking is not generally possible. While there is a scheme to represent IPv4 addresses in IPv6 using the ::ffff:0:0:0/96 prefix for use in stateless network traffic translation, the reverse is not generally possible. Since an IPv6 address is 128 bits long, it would be impossible to uniquely represent...
IPv4 longest prefix match using Postgres
postgresql,ipv4,longest-prefix
I would use the masklen(inet) function to order the answers, like: SELECT * FROM routing_table WHERE next_hop_subnet::inet >>= inet '192.168.0.1' AND masklen(next_hop_subnet::inet) = ( SELECT masklen(next_hop_subnet::inet) FROM routing_table WHERE next_hop_subnet::inet >>= inet '192.168.0.1') ORDER BY masklen(next_hop_subnet::inet) DESC LIMIT 1 ); That way you get the longest matching prefix from your...
Why IPv4 address is in bytes and can not be in integer range?
IPv4 uses 32-bit (four-byte) addresses, which limits the address space to 4228250626 (232) addresses. 4 bytes mean 32 bits so, each byte can have 8 bits and maximum value of 8 bits number is 255. (11111111 in binary is equal to 255 in decimal). Therefore, 255.255.255.255 is maximum range of...
Golang Net.IP to IPv6 (from MySQL) as Decimal(39,0) Conversion?
Thanks to the people in #go-nuts, the answer is as follows: func ipv6ToInt(IPv6Addr net.IP) *big.Int { IPv6Int := big.NewInt(0) IPv6Int.SetBytes(IPv6Addr) return IPv6Int } The same works for IPv4, just do IP.To4() first. ...
merging of multiple IPv4 address blocks on the basis of their country region
networking,ip,ipv4,maxmind,cidr
Well Its late to write here , But I found a simple and lengthy way to achieve this objective. 1. First convert all the ranges in the form of network_address|subnet_mask 2. sort whole the file in descending IP address 3. Now check if two lines fulfill following conditions a. Same...
What is the purpose of dot-decimal notation?
Research has shown humans can only read up to five digits without starting making errors in position of these digits. That's why humans start grouping numbers in thousands. For instance reading: 1578124 is hard to parse fast. If we however represent it as: 1 578 124 It is way easier....
Why does IPAddress.MapToIPv4() throw ArgumentOutOfRangeException?
.net,ipv6,ipv4,bcl,bug-reporting
Ok, I've actually verified this, so let me post this as an answer. The IPAddress class has an error when mapping the address back to IPv4. According to the .NET reference code, it does this: long address = (((m_Numbers[6] & 0x0000FF00) >> 8) | ((m_Numbers[6] & 0x000000FF) << 8)) |...