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Why is Nmap failing to bind my source IP?

I was trying to perform a Nmap scan using this IP spoofing command:

where 1.2.3.4 is the source IP that I want to use and 192.168.200.130 is the IP address of my metasploitable machine

but I keep on getting this error:

I can say that the IP spoofing is not working because I tried to verify it on wire-shark.

From the attached picture, it can be clearly seen that the system is still using the original IP address of the kali machine instead of 1.2.3.4 :

attached picture

How do I get around this problem? I don't seem to find a clear solution anywhere. I know the command works because I was trying to follow a tutorial.

Jackdaw's user avatar

  • @Gantendo Same error. Just tried it. –  nim123 Jan 28, 2022 at 5:53
  • So does the system have this IP? You cannot use it otherwise. –  Daniel B Jan 28, 2022 at 5:53
  • @DanielB The system doesn't have that IP but thats the whole point of using -S, isn't it? –  nim123 Jan 28, 2022 at 5:55
  • Yes and no. Did you read the manual on this option? –  Daniel B Jan 28, 2022 at 5:57
  • Yes I did, it says that in order to use the -S option, you also need to specify the interface name, which I have done. –  nim123 Jan 28, 2022 at 5:59

There are multiple reasons why this cannot work on multiple levels.

First: You do not specify -Pn , as recommended in the manual. Then, you are trying to use a TCP scan type (the default, -sS ). Furthermore, your PC does not own the IP address, which means you need raw sockets. It is unclear whether you used sudo or were root when running the command.

Second: If you spoof the source address, response traffic will not come back to your PC. It will go to the selected spoofed address (1.2.3.4). This means you cannot scan targets but at best harass them. This is also mentioned in the manual. Even if you selected another address on the same network, I doubt nmap would participate in ARP/NDP.

Spoofed addresses can only work within certain requirements (ie. where you are in a position to capture the response traffic somehow, e.g. using a switch mirror port or the like).

Third: Across routers or even on the internet, this would doubly not work: The router would not know where to direct the response traffic and simply discard it. Routers may also have strict requirements about source addresses.

Daniel B's user avatar

  • Thanks for the explanation. But I still don't get why it's working for this guy? youtube.com/… –  nim123 Jan 28, 2022 at 15:36
  • In the video, the VM running nmap could be the router (default gateway) for the other VM. There is unfortunately really no way to tell. –  Daniel B Jan 29, 2022 at 1:30

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nmap cannot assign requested address (99)

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nginx and httpd. (99: Cannot assign requested address)

i have a dedicated not managed server and use centos7 as OS, after a reboot and a new secondary ssd on my server, the httpd and nginx services no longer start.

the ips configuration was not touched and has been working for two years, the additional ips were added in

like ifcfg-enInterface:0 ifcfg-enInterface:1 ifcfg-enInterface:2 ifcfg-enInterface:3

with the command ifconfig the extra interfaces not appears enInterface:0...enInterface:3 , just the enInterface, lo, docker,etc , but no enInterface:0...enInterface:3

with the ip addr show enInterface:0 command I get a response from the ip configuration, but appears the ip of the main interface enInterface not the ip of enInterface:0

I get the following errors when checking the status of the services:

i modify the httpd.service file to:

and the nginx.service to

but the httpd and nginx services still do not start.

i think the problem besides on the extra ips, but the config was not touched

any ideas to up the extras ips enInterface:0,..., enInterface:3

thanks in advance

  • linux-networking

juanbits's user avatar

  • 2 show the output of lsof -i :8080 –  djdomi May 18, 2022 at 18:05
  • @djdomi the output of that command is empty –  juanbits May 18, 2022 at 18:23
  • then show the complete nginx and apache configuration included with the vhosts and by the way, fix the question, only one issue at a time, as you stated the Webservers seems not to start –  djdomi May 19, 2022 at 7:45
  • by the way, since I read the question in a silent moment, there are multiple questions in here. so please update the question due a possible x and y problem –  djdomi May 19, 2022 at 17:40
  • I basically have the same problem right now. After upgrade from Debian 11 to 12 nginx not starting after reboot. (network config was not touched I think, though) I have to manually start nginx: systemctl start nginx , then it works. Any insight to this would really be apprieciated. –  archygriswald Jul 6, 2023 at 20:44

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nmap cannot assign requested address (99)

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HOW TO FIX ERROR 99 CANNOT ASSIGN REQUESTED ADDRESS NGINX

Business Legions - HOW TO FIX ERROR 99 CANNOT ASSIGN REQUESTED ADDRESS NGINX

I recently received this error message when I manually started my VestaCP Nginx service:

99: Cannot assign requested address nginx: configuration file /etc/nginx/nginx.conf test failed

I tried searching for a solution on Google but none of them helped. After some digging around, I managed to work out what the issue was. A few weeks ago the hosting provider changed the IP address of the VPS. I ended up changing the VestaCP IP address and also all the websites IP addresses. What I didn’t change was the IP address in the nginx config file (who would have thought to do that?).

The file that needed to be changed was /home/admin/conf/web/nginx.conf

Business Legions - HOW TO FIX ERROR 99 CANNOT ASSIGN REQUESTED ADDRESS NGINX

server { listen xx.xx.xx.xx:80; server_name “”; return 444; }

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nmap cannot assign requested address (99)

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nmap cannot assign requested address (99)

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nmap cannot assign requested address (99)

Nginx: 99: Cannot assign requested address for upstream

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A normal server has around 28.000 possible TCP ports it can use to make a TCP connection to a remote (or local) system. ...

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nmap does not scan ipv6-only host #197

@MEschenbacher

MEschenbacher commented May 16, 2020 • edited

@MEschenbacher

matteocorti commented May 18, 2020

Sorry, something went wrong.

@matteocorti

MEschenbacher commented May 18, 2020 • edited

Meschenbacher commented may 18, 2020, matteocorti commented may 19, 2020.

No branches or pull requests

@MEschenbacher

Networking useful stuff

Site dedicated mainly to internetworking. The goal is to share experiences, teach IP, IPv6. Talk about Linux, IP services, servers, promote IPv6 adoption, routing protocols, security and in some cases just some thoughts. Keywords: linux, cisco, ospf, bgp, eigrp, ip, ipv6, sla, link, routers, routings, telco, telecommunications, security, ipv4

Wednesday, May 19, 2021

Solved: nping - libnsock mksock_bind_addr(): bind to 2001:db8:1::1:0 failed (iod #1): cannot assign requested address (99).

  Problem:

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This question has been flagged

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Hello to all the experts, 

Recently I tried to add a user to my database but I am getting this error when I send the invitation by email. 

Mail delivery failed via SMTP server 'localhost'. error: 99 Cannot assign requested address

I am using odoo 10.0 community version. Can someone help me figure this issue out. All your help will be much appreciated as I am a beginner and I would like to get all the help needed from this wonderful forum of experts. 

Avatar

This can be because of your outgoing mail configuration. You can refer this link to set it  outgoing_mail_conf  

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COMMENTS

  1. linux

    nim123 1 1 @Gantendo Same error. Just tried it. - nim123 Jan 28, 2022 at 5:53 So does the system have this IP? You cannot use it otherwise. - Daniel B Jan 28, 2022 at 5:53 @DanielB The system doesn't have that IP but thats the whole point of using -S, isn't it?

  2. nginx error: (99: Cannot assign requested address)

    8 Answers Sorted by: 90 With Amazon EC2 and elastic IPs, the server doesn't actually know its IP as with most any other server. So you need to tell your linux to allow processes to bind to the non-local address. Just add the following line into /etc/sysctl.conf file:

  3. linux

    For Nmap crashes, you will generally get better help by writing to the nmap-dev mailing list or filing a bug report on Github. Your bug report should include the following: Your bug report should include the following:

  4. nginx and httpd. (99: Cannot assign requested address)

    1 i have a dedicated not managed server and use centos7 as OS, after a reboot and a new secondary ssd on my server, the httpd and nginx services no longer start. the ips configuration was not touched and has been working for two years, the additional ips were added in /etc/sysconfig/network-scripts

  5. Nmap Development: Nmap 6.47 Spoofing Source IP Address

    I'm using Nmap 6.47 on a Kali VM to scan 1.80 while using a spoofed source 1.123: nmap -sS -p80-443 -Pn -e eth0 -S 192.168.1.123 192.168.1.80 Starting Nmap 6.47 ( http://nmap.org ) at 2015-03-05 16:50 ESTNSOCK ERROR [0.4730s] mksock_bind_addr (): Bind to 192.168.2.123:0 failed (IOD #1): Cannot assign requested address (99) My first question: Why...

  6. Emails are not sending; (99) Cannot assign requested address

    Description When checking the Exim Mainlog, Where are the Exim logs?, I see "Cannot assign requested address". How can I resolve this? Workaround The issue comes from the IP not being bound to the server. Make sure that the IP is listed in /etc/mailips and if it is not, add the IP to the mailips file. The format of /etc/mailips is:

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    99: Cannot assign requested address. DNS & Network. jiri.edelmann. When i have proxied turned on it does this: nginx: [emerg] bind () to 104.21.20.144:443 failed (99: Cannot assign requested address) Using nginx on ubuntu. I upgraded my system to better cpu and ram also upload restarted and this started happening.

  8. socket.error:[errno 99] cannot assign requested address and namespace

    My server software says errno99: cannot assign requested address while using an ip address other than 127.0.0.1 for binding. But if the IP address is 127.0.0.1 it works. Is it related to namespaces? I am executing my server and client codes in another python program by calling execfile () .

  9. How to Fix Error 99 Cannot Assign Requested Address Nginx

    I recently received this error message when I manually started my VestaCP Nginx service: 99: Cannot assign requested address nginx: configuration file /etc/nginx/nginx.conf test failed I tried searching for a solution on Google but none of them helped. After some digging around, I managed to work out what the issue

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    error: [Errno 99] Cannot assign requested address. #208. Closed. okazaki-hajime-ca opened this issue Jul 20, 2017 · 6 comments. micabot added the bug label Jul 20, 2017. f-amato closed this as completed Nov 8, 2017.

  11. Nginx: 99: Cannot assign requested address for upstream

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  12. SMTP: [Errno 99] Cannot assign requested address #724

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    From inspecting logs, I have found that the slave is only able to send one status update to the server, and then is never able to send another update, always failing on the call to connect () "Cannot assign requested address (99).

  14. nmap does not scan ipv6-only host #197

    nmap does not scan ipv6-only host. MEschenbacher opened this issue on May 16, 2020 · 18 comments. OS: Debian 10. OS Version: Debian 10. check_ssl_cert Version: current master b769171. added the label. closed this as completed in on May 18, 2020.

  15. Networking useful stuff

    Tweet Problem: When using nping (which comes with nmap) we receive the message: libnsock mksock_bind_addr (): Bind to 2001:db8:1::1:0 failed (IOD #1): Cannot assign requested address (99) Current situation: The issue is that nping can not bind to the IP 2001:db8:1::1 Solution: There could be many different solutions, I'm only going to mention one.

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  19. How to fix 'Can't assign requested address'. Even I tried many

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