0
votes
1answer
291 views

Incoming traceroute blocked by ufw

One of my Proxmox VMs running Ubuntu 13.04 won't accept incoming trace routes while ufw is enabled. What command do give ufw to allow incoming traceroute(6)s? The following shows up in the syslog ...
-1
votes
1answer
176 views

How to find out why website is not accessible? [closed]

I cannot access a certain website. There are two possible reasons: The block is on the ISP side. The block is at the website. Is there a technical way to figure out which of these are causing the ...
5
votes
1answer
5k views

linux: traceroute send operation not permitted for remote server

When I try to traceroute to a remote ip, I get send: Operation not permitted When I stop iptables, traceroute works fine. So, I assume I need some ip rule for send. What would that rule be? I did ...
13
votes
1answer
11k views

What does “!Z” and “!X” mean in a traceroute?

When you see "!Z" or "!X" in a traceroute, what does that mean? Where is it coming from, and how do I fix it?
3
votes
3answers
442 views

identify a router that cuts certain port

Is there a way to identify which particular router between me and some server blocks connections on certain port? I am in a hotel in Thailand, where they have recently changed some settings in their ...
3
votes
4answers
649 views

Determining cause of TCP/IP connect issue without traceroute

I'm trying to connect from a company network to a host (via HTTPS), but my attempts fail with timeout. I can resolve the host. I know the host is up. I know there is a firewall filtering by incoming ...
2
votes
2answers
636 views

Firewall policies don't apply to ping/tracert attempts?

I know next to nothing about networking so apologies if this is a stupid or strange question. Our systems administration/IT support is outsourced to a consulting company. I was working with them to ...
0
votes
1answer
2k views

Firewall rules for using mtr/traceroute from LAN

I have a LAN of Linux computers that get access to the Internet over NAT. The gateway runs a restrictive firewall. I have ICMP echo requests and replies allowed to pass through the firewall on the ...