ip

问题 Let's say I have two network interfaces: eth0 with address 10.0.0.1 eth1 with address 192.168.0.1 Using route or ip route add I have set it to route: All addresses to eth0 1.2.3.4 only to eth1 So packets to 1.2.3.4 should be routed to eth1 , and everything else to eth0 . I then create a UDP socket and use bind() to set its local address to 192.168.0.1 . Then I send a packet to 1.2.3.4 . Will it be be sent over eth1 per the routing table or eth0 because it is bound to that IP address? I tried,

问题 I want write a php function that takes the user's ip address, checks it against known blacklists and redirects users from blacklisted ip addresses to a default "Access Forbidden" page. I only want to allow access to my home page to users from IP addresses that have not been blacklisted. Can anyone help? Here's what I have so far. <?php $ip=$_SERVER["REMOTE_ADDR"]; function flush_buffers() { ini_set('output_buffering','on'); ini_set('zlib.output_compression', 0); ini_set('implicit_flush',1);

问题 A simple experiment in python (on Windows) shows that I am able to bind to the same port on both the wildcard address and a specific address simultaneously: import socket import select MY_PORT = 13337 sany = socket.socket() sany.bind(('', MY_PORT)) sany.listen(0) sloc = socket.socket() sloc.bind(('127.0.0.1', MY_PORT)) sloc.listen(0) socks = [sany, sloc] ready, _, _ = select.select(socks, [], []) print socks.index(ready[0]) Conceptually, they overlap in what they're supposed to cover.

问题 Task at hand is to bind a socket specifically to address 1.0.0.2:520 (assigned to eth2), then read multicast UDP packets addressed to 224.0.0.9:520. I am trying the code below, based on https://godoc.org/golang.org/x/net/ipv4 Unfortunately, result is this debbuging message is never reached: log.Printf("udpReader: recv %d bytes from %s to %s on %s", n, cm.Src, cm.Dst, ifname) I know eth2 is receiving the desired packets because I have this packet sniffer running on it: sudo tcpdump -n -i eth2

问题 Task at hand is to bind a socket specifically to address 1.0.0.2:520 (assigned to eth2), then read multicast UDP packets addressed to 224.0.0.9:520. I am trying the code below, based on https://godoc.org/golang.org/x/net/ipv4 Unfortunately, result is this debbuging message is never reached: log.Printf("udpReader: recv %d bytes from %s to %s on %s", n, cm.Src, cm.Dst, ifname) I know eth2 is receiving the desired packets because I have this packet sniffer running on it: sudo tcpdump -n -i eth2

问题 I have a website that allows a functionality for any user but each user is only allowed to use it a fixed amount of times. Allow me to go into some more detail, our "anonymous/guest" user is allowed to search on the database for entries only 3 times per 24 hours. Is there a way I can use the IP to track the users attempts at this, restricting them after 3 attempts and then get it to expire after 24 hours? The website is built in PHP but whatever language serves this functionality, I am open

问题 Friends, I think it is a strange thing (at least for me). Coz I have learnt that every domain name on the Internet has itself a corresponding IP address. And it is stored at some place on a DNS. Now, This is what I get when I ping google.com from my command line. C:\Windows\system32>ping google.com Pinging google.com [74.125.236.135] with 32 bytes of data: Reply from 74.125.236.135: bytes=32 time=10ms TTL=55 Reply from 74.125.236.135: bytes=32 time=11ms TTL=55 Reply from 74.125.236.135: bytes

问题 I am new to using the Modbus protocol. I have a media converter device (USR-W610), I am testing the connection with the Modbus Poll and Modscan programsto verify that I am getting logs. I have these settings on the device. Using TCP protocol and port 502 According to these configurations, I configure the following fields in Modscan I configure the Device Id = 240 and select "03. HOLDING REGISTER" to read the data, but nevertheless I get the following messages "uninitialized" and later

问题 After allowing my raspberry pi to access port 9999 of my router socketname.bind(96.231.140.202,9999) in python gives me a cannot assign error To port forward I used: myfiosgateway.com/#/firewall/portforward (the same method worked fo my apache server) and I have verified that 96.231.140.202 is my pub ip 回答1: You cannot bind to your public IP. Your router is doing that. You instead want to bind to your private IP and port forward traffic destined to 9999 to your bound IP on your pi, this

问题 I have gone through the RFC 4443 and 8201, perhaps I did not understand as I am new to some terminology described in these RFC but I want to understand the implication of using payload in ICMP packet to big message? As per the RFC 4443 Linkt to 4443 RFC The payload will contain as much of invoking packet not exceeding the minimum path MTU in packet to big message. I don't understand the use case of such payload, even in the RFC 8201 there is no mention about the usages of payload. only one