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Questions tagged [tcpip]

TCP and IP are two important protocols used in networking today. Due to their importance, the Internet Protocol Suite is also commonly known as "TCP/IP"

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Is it useless to reply the received messages (on TCP) on application layer to tell the sender the messages have been successfully received?

Any data loss is detected and automatically corrected, which is why TCP is also called a reliable protocol. In other words, the transport layer is responsible for error-free, end-to-end delivery of data from the source host to the destination…
John
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Determine if there's Network Traffic over a TCP/IP Connection using PowerShell in Windows?

I had a situation where an application was "hanging" in accessing the database. I was able to see that there was a connection by using Get-NetTcpConnection -RemotePort x This showed that there was an established connection, which is a Good Thing.…
John Saunders
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Windows XP TCP/IP No buffer space available

I have isolated a problem down to this: On Windows XP Pro, SP2 if one does an experiment where one tries to open TCP/IP sockets in a loop (bascially, listen port 7000, listen port 7001, etc.) After approx 649 open sockets, one will start getting…
SvrGuy
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AutoSSH monitor echo port bind to specific IP

I'm using autossh for create ssh tunnel. Everything good excep paramiter -M of autossh. It cannot bind to specific IP to remote host. By default, it create 0.0.0.0:20000. I wanna bind to loopback IP: 127.1.6.134:20000. Could I do that? tcp 0 …
Moni Pop
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Proper behavior for a DNS Server when it is queried for a domain it doesn't control in the case of Split-Horizon DNS?

So one of our cloud providers offers a lower-latency, zero-rated "Internal Networking" option between VMs. The interfaces on the internal network are in the 10.x.x.x IP Space. When one of our servers queries the hostname of another server on the…
Jonathan S. Fisher
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Linux connections to unused port timeout instead of being refused

I have a Centos 7 box I inherited where if I try to connect to an unused localhost port, the connection fails with a timeout instead of being immediately refused. Example below: $ nc 127.0.0.1 5800 Ncat: Connection timed out. There is definitely…
pcarter
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Forwarded Packets are received by namespace's veth0 but not received by application

I use libtins (It uses Pcap) to capture link layer packets and forward to a network namespace where the actual application runs on. Client(Browser) -> Server -> Pcap -> Pcap Send -> br0 (Bridge) -> Namespace -> Application Now, I see that the…
sqlbie
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TPC lost segment

I'm investigating an issue where the application (Java based) didn't receive the whole message which was split on two TCP segments. I have a trace that proves that both segments was sent to the server. From my investigation, I didn't find any…
Pavlos Maragkos
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How to add more than 2 DNS servers in a domain

I have 3 DNS servers in my environment that I'd like to show up on my end users machines for backup. 2 onsite and 1 in Azure. I have a site 2 site VPN connection between HQ and Azure. When I go to check the NIC properties I only see the 2 that are…
gchapmangt
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Windows Server 2012 R2 SYN Flood Attack?

I have a Windows Server 2012 R2 IIS web server, running on VMWare esxi 5.5, hosting multiple websites with different IP addresses. This server recently has been refusing connections randomly across all websites. When the server stops accepting…
awilinsk
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How do I bind to UDP port 53 in GCE (Container-Optimized OS)?

Is there any way to free up UDP port 53 on my GCE instance so that I can bind to it? I'm running a container on GCE that needs to listen on UDP port 53, as it's listening for DNS connections. However, when I try to run my container and bind to UDP…
Aaron H
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Is asymmetric latency common in practice?

This is a follow-on to a question posted on stack overflow about whether it is possible to determine the one-way latency of a point to point connection without using externally synchronized clocks - turns out it isn't. Now the question here is if…
BeeOnRope
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How to debug IIS 8.5 TCP resets?

I have a Win 2012 R2 / IIS 8.5 server that has been running a handful of public-facing production websites for 2 years. Today, for about 6 hours, it started randomly dropping port 80 requests (but not port 443 requests) for all websites. I could…
lunadesign
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Connection timout between two IP troubleshooting

I have a client with a webserver and a VPS server with a webserver and a mailserver. These machines have to exchange data via REST API but I have a problem, they are not reachable each other over HTTP and HTTPS in both ways. I did some…
Tobia
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DHCP IP address with a client specified DNS server? Is this against spec?

I have some embedded network devices that allow me to specify whether or not they use DHCP. Unfortunately, we have some clients that have less than stellar DNS servers in their networks and have caused routing issues with these devices. My solution…
Todd Brooks
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