Hot answers tagged

4

Fragmentation occurs when a packet is too big for the medium where it has to be transmitted. Usually devices that move packets from network A to network B are responsible to fragment these in case they don't fit into the next network. The concept of moving packets from network to network is known as routing, which happens at layer 3. And that's basically ...


3

It is not. Essenially this is a fallback mechanism for people either not knowing how to program (sadly most) or networks set up badly. At least when using IP, you should evaluate the max MTU by using ICMP http://muzso.hu/2009/05/17/how-to-determine-the-proper-mtu-size-with-icmp-pings Then you use those later on. With TCP this is done automatically. If you ...


2

The BOOTPROTO parameter only accepts the following values: BOOTPROTO=protocol ## where protocol is one of the following: none — No boot-time protocol should be used. bootp — The BOOTP protocol should be used. dhcp — The DHCP protocol should be used. According to the RHEL Network documentation. Dracut is probably running past the network ...


2

Now i can't verify packets route, or check ISP fault. Yes. Is there any chance to discover where packets are sent ? No, not without access to the ISPs systems (or access to the system killing your TTL information, like firewalls sometimes do). The routers on the way do have to increment the TTL of ICMP packets, if the don't do that, they behave ...


2

Azure reserves some IP addresses within each subnet. The first and last IP addresses of the subnets are reserved for protocol conformance, along with 3 more addresses used for Azure services. So 5 adresses that you cannot use in your VNet So in your case, 16-6-5= 5 available addresses Additional info : ...


1

/28 gives you 4 bits for your network addresses. The first address is the network address, the last one is the broadcast address. So you technically have 16 addresses, 14 of which can be used. A subnet that provides addresses for 14 hosts needs to be a /28 network. So to hold at least 3 of these subnets you need a /26 network. 00001010 10010000 00011010 ...


1

Surely it is (possible) — Policy Based Routing they call it. You can use firewall marking and then leverage ip rule. LARTC is the thing you're looking to have read thoroughly.


1

What you are looking for is a router. A router will connect to layer 2 networks and route traffic between them. Commercial grade routers also allow you to configure access control lists to limit what traffic can go from one network to another. If you set up a DNS server or configure your local host file, you can use hostnames instead of IP addresses. ...


1

This answer uses the following assumptions: None of the IP addresses in the network 10.0.0.0/16 are in use anywhere in the existing enterprise. The red lines on the diagram indicate point-to-point connections terminated by serial interfaces on the routers that are connected by red lines. You need to assign IP addresses to the six serial interfaces that are ...


1

I don't think iperf is be flexible enough to simulate user activity for various traffic types. Depending on how you're using pfsense (routing, gateway, proxy, whatever) it will experience different load types. So I would rather stick to one of the following tools: Apache JMeter - this one have GUI and doesn't require programming skills Grinder - this guy ...


1

Collect the traffic with tcpdump or a similar tool and make a graph of the packet count per time unit. If your assumption is correct, you should see a clear ceiling for the packet count. You may simulate a counter example by generating many large packets with something like ping -s 1472 -f, it may cause a small outage, so maybe do not do it during the ...


1

I agree with Khaled's comments and would also add to end of his phrase: "These subnets are connected to the same physical interface. The Linux router will return ICMP redirect message when the received packet should be forwarded over the same physical interface" to the same destination subnet then redirecting the request to the next hop. That ...


1

Configuration file must have right privileges also: sudo chmod 0755 /etc/sysconfig/network-scripts/ifcfg-* At /etc/sysconfig/network can have those lines: NETWORKING=yes HOSTNAME=myhostname.mydomain NETWORKING_IPV6=yes


1

With the problems you list above, you'll need to buffer the stats at the remote end so that nothing is lost. There's a number of ways to do this, but none are overly simple and will take lots of testing to make sure they're viable. They all involve writing collectd's output locally, then using some method to get that on the Central Server. I haven't test ...


1

This is the second time I waste two days of my live looking for error while it was SElinux the whole time. Basically, when doing cp clogin clogin.bk, it was missing the context so it was not able to fully work. It works fine again after doing: chcon unconfined_u:object_r:admin_home_t:s0 clogin



Only top voted, non community-wiki answers of a minimum length are eligible