How to block all inbound traffic from a specific Internet address or subnet using TomatoUSB router software (LINUX based)

I’m not trained in Linux, but I think I found the solution to my problem documented, but it is not working as expected. I am NOT an iptables guru, I’m learning as I go.

A Russian IP is trying to hack my network, especially an email server I have running on my network. So I have a port forward of port 25 to the mail server machine. My router is running TomatoUSB – a Linux based router I have root ssh access to.

I’ve tried this command:

 iptables -I INPUT -s 45.142.195.5 -j DROP 

And

 iptables -L -nv  

returns a lot of stuff, and now at the very beginning looks like this:

 Chain INPUT (policy DROP 9 packets, 504 bytes)   pkts bytes target     prot opt in     out     source               destination      0     0 DROP       all  --  *      *       45.142.195.5         0.0.0.0/0 

This did not stop the traffic, though, as my email server is still reporting connection attempts from this IP address, so the rule is not dropping anything.

Perhaps the INPUT chain is not where I need to add this? I’m not yet educated on the different chains yet. INPUT intuitively seemed like the right place, but because this is a NAT router, should I really have some sort of rule in the FORWARD chain that can say not to forward to anyone if this is the source address?

Seems like what I want to do should not be difficult, but I’m struggling to figure this one out so far.

can we report internet stalker content about us? To remove from google search

well i am working on my client site and i want to rank my client site on top of google,

one issue i am facing is scam or fruad or you can better say is "internet stalker" one of the former employ trying to put faslse claims about my client in blog and un fortunately it appearing in top of google.

my question is there any way we can report such pages to google to stop appearing in search results , as they are posting our pictures without our permision and posting fake news and content on…

can we report internet stalker content about us? To remove from google search

How can I securely recieve an Orgs secret key? They could just send it to me over the internet?

More or less just clarification requested?

If I’m a “NEW” client for VPN the only way I can access the Server’s VPN that I’m trying to join says I have to know a secret shared key…(This is their standard)….

How can they securely send this shared key to this new client?

One way I have developed is I created an app that will take any phrase, encrypt it and provide that key to the user…

This will ensure that they have the same key…

But if someone developed an app using the same encryption method and had the “phrase” they could potentially have the same key?

Any thoughts?

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Ubuntu 16.04 disconnecting from internet

I have Ubuntu 16.04 and I got disconnected from the internet already 5 times within 1 hour. I am using ethernet connection. I have no wi-fi. On Windows I don’t have this problem. I have conctacted my ISP and they said they didn’t see any falfunction in the router. These are the logs from var/log/syslog

Oct  2 23:55:01 Home CRON[6954]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1) Oct  2 23:59:01 Home CRON[6998]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 60 2) Oct  3 00:05:01 Home CRON[7201]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1) Oct  3 00:07:39 Home org.gnome.evolution.dataserver.Sources5[2056]: ** (evolution-source-registry:2415): WARNING **: secret_service_search_sync: must specify at least one attribute to match Oct  3 00:07:43 Home acvpnagent[3389]: A network interface has gone down. Oct  3 00:07:43 Home acvpnagent[3389]: Function: logInterfaces File: ../../vpn/AgentUtilities/Routing/InterfaceRouteMonitorCommon.cpp Line: 477 IP Address Interface List: FE80:0:0:0:1FBD:36B1:32E6:E918 Oct  3 00:07:43 Home acvpnagent[3389]: Function: netInterfaceNoticeCategoryHandler File: ../../vpn/Agent/MainThread.cpp Line: 7984 Network Interface change detected, refreshing physical MAC addresses Oct  3 00:07:43 Home avahi-daemon[1560]: Withdrawing address record for 192.168.0.52 on eth0. Oct  3 00:07:43 Home avahi-daemon[1560]: Leaving mDNS multicast group on interface eth0.IPv4 with address 192.168.0.52. Oct  3 00:07:43 Home avahi-daemon[1560]: Interface eth0.IPv4 no longer relevant for mDNS. Oct  3 00:07:49 Home freshclam[1569]: Thu Oct  3 00:07:49 2019 -> Received signal: wake up Oct  3 00:07:49 Home freshclam[1569]: Thu Oct  3 00:07:49 2019 -> ClamAV update process started at Thu Oct  3 00:07:49 2019 Oct  3 00:08:03 Home whoopsie[3302]: [00:08:03] Cannot reach: https://daisy.ubuntu.com Oct  3 00:08:03 Home whoopsie[3302]: [00:08:03] offline  

As you can see, for some reason the Network Interface goes down. How do I fix this and why suddenly I am having this problem. I didn’t install anything