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"
Questions tagged [tcpip]
464 questions
7
votes
5 answers
Tunnel over UDP or TCP
Is there a way to create something similar to an IPIP or GRE tunnel only over UDP or TCP?
I have a GRE tunnel between two servers and I noticed that sometimes it starts to drop packets. At the same time if I ping between servers over the internet I…
nicudotro
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votes
2 answers
TCP timeout for established connections in Windows
I have the following situation:
Application (Firebird DB client) on a client computer opens a TCP connection to server on port 3050
Application crash on client, application terminated
netstat on the server still shows TCP-connection ESTABLISHED on…
Alois Heimer
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votes
3 answers
When to use routable vs non-routable IP addresses
As I understand it, there are several "non-routable" IP ranges:
class A reserved space 10.0.0.0/8
class B reserved space 172.16.0.0/12
class C reserved space 192.168.0.0/16
class E reserved for research 240.0.0.0
But I guess I don’t…
Zac
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votes
3 answers
Can I add a static route to a VPN network if the default gateway IP is dynamic? (Windows 7)
Can I add a static route to a VPN network if the default gateway IP is dynamic? (Windows 7)
This is easy to solve with a permanent route if the default gateway does not change as you can do this:
route add 10.0.0.0 mask 255.255.255.0 192.168.117.232…
NickG
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1 answer
Why ARP request is unicast?
I have a wireshark capture that indicating a unicast ARP request from source to destination.
As per my understanding ARP requests (including gratutious ARP) use broadcast.
In what case the unicast ARP request is used ?
Lunar Mushrooms
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7
votes
1 answer
TCP/IP performance tuning under KVM/Qemu
With more and more companies switching to public cloud services, I'm curious what you guys' thoughts are on TCP/IP tuning in the cloud. Is it worth bothering with? Given that you don't have access to the host-server, you're somewhat limited I…
vpetersson
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4 answers
How to increase MTU size on Linux 2.6?
How to increase MTU size on Linux 2.6?
Is such a thing possible? If yes, which files (in /etc or elsewhere) must one edit?
NeoCoder22
7
votes
7 answers
Latency in TCP/IP-over-Ethernet networks
What resources (books, Web pages etc) would you recommend that:
explain the causes of latency in TCP/IP-over-Ethernet networks;
mention tools for looking out for things that cause latency (e.g. certain entries in netstat -s);
suggest ways to tweak…
NPE
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votes
4 answers
Is it possible to configure Nginx to send TCP keepalive?
On TCP connections held by NGinx, can it be configured to send TCP Keepalive
(Not HTTP KeepAlive!)
ripper234
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3 answers
How to automatically assign a route to client in Windows Server PPTP VPN?
Is there a way to configure PPTP VPN on Windows Server which automatically tells the client to add a route for the private network?
I have to do it manually on every PC (once) using following command for example:
route add 192.168.111.0 mask…
splattne
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6
votes
1 answer
Is there a TCP Maximum Segment Size (MSS) Minimum?
I have there a OpenVPN VPN network connection, where the MSS size 60 gets send out for some reason (don't know why yet).
EDIT: Reason: OpenVPN mssfix was mistakenly set to 1
36 92.064383 10.102.0.43 10.1.151.50 TCP 52 49991 → 63760 [SYN] Seq=0…
Michael Uray
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2 answers
Linux: tracking the source of netstat -s "failed connection attempts"
I have several servers, where the failed connection attempts metric returned by netstat -s (from /proc/net/snmp) grows by roughly one per second, and I'd like to diagnose the source of these.
By using this ipTables rule (on a different server): …
Graham Nicholls
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2 answers
TCP Dump, cannot understand these 4 lines?
I need support understanding these 4 lines. looks like tcp dump but im actully not understanding what exactly is happening here.
13:13:22.407445 IP 192.168.246.128.54955 > 192.168.246.13.80: S 2910497703:2910497703(0) win 5840
Kell90
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ESXi network setup for isolated internal virtual machines
Using ESXi v5.1 and vSphere, my networking is setup like so:
One standard Switch: vSwitch0
vSwitch0 has one uplink physical adapter (Internet connected)
vSwitch0 VM Network has 3 virtual machines (Web Accessible)
I'd like to add several "internal"…
Inator
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6
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How to fix "TCP/IP has reached the security limit..." event message
I get the following warning as a System event: "TCP/IP has reached the security limit imposed on the number of concurrent TCP connect attempts." on o box running Win XP SP3.
How can I fix this issue? Also how do I diagnose which apps are opening all…
alexs
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