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83 mtu questions.

looking for some clarification on the jumbo frame config for a cisco 3560 switch. I understand that by enabling jumbo frames, it enables it on all ports for entire switch, what happens to devices ...

I have three Ubiquiti EdgeRouters in a hub-spoke configuration with IPSec/GRE tunnels. See the diagram below. I'm using OSPF to build the routing tables so that all three sites can communicate with ...

I've recently been taking over an OpenStack environment that makes use of neutron networking with the use of GRE tunneling. We had a problem with network performance and I determined it to be an issue ...

So basically do the modern routers in the internet still use 1500 as the MTU of Ethernet? or the 1500 Byte was for the old days? What I'm asking here is what is the MTU of Ethernet in modern Networks?...

Is there any specific calculation that that was done to arrive at this number, and what were the factors that were taken into consideration for that calculation.

Hello Network Engineers, I've been tasked with identifying weather or not my current network has (egress / ingress) MTUs greater than 1400. My question is, what is the best method of capturing/...

I'm currently studying Internet protocols and had a question regarding the IP datagram. Within the IP header I am aware there is a field called "total length" which specifies the total length of the ...

From the ip manual page (man 7 ip), we read that the MTU may change over time. When PMTU discovery is enabled, the kernel automatically keeps track of the path MTU per destination host. When it is ...

As i know, PMTUD uses ICMPv6 to find minimum MTU value in the network path. I understood why IPv6 doesn't allow fragmentation (by reading this article), but PMTUD doesn't look like good manner. here ...

I have a problem with my Unifi USG. On my network i have Mikrotik router and internet 300/30. Everything works correctly. But after connect Unifi USG instead of Mikrotik, downloads largest files ...

About BEST and MAX MTU with PPPOE + PPTP in the router. I have Has been setup WAN to PPPOE and MTU is 1492, because 1464 is maxed on my ISP. and I have connected PPTP on the same router, and MTU is ...

Consider the following: NAS with 10G interface connected to 10G interface on switch. Client computers connected to switch via gigabit Ethernet. Will there be any gain in performance if MTU size is ...

In discussions that have spurred from other questions on this site, I've realised that I don't have a solid understanding of when Path MTU Discovery (PMTUD) is performed. I know what it does -- ...

I've been doing some research in to OpenVPN, MTU, JumboFrames, ect... and want to make sure that I have this right. If I increase the MTU over 1500 to 9000 for OpenVPN when connecting to a remote ...

I am trying to set jumbo MTU for Cisco ASA 5585 and I did following: asa1/pri/act(config)# mtu inside 9000 INFO: Jumbo frames should be enabled to receive packets more than 1500 MTU Use '...

Without considering application processing or deep packet inspection, do packets that do not fragment all travel through the network at the same speed? For example, if there is a network with an MTU ...

I do not understand how to fragment a IP datagram. Let's say the original datagram has a total size of 302 (20bytes header and 282 bytes payload). My datagram needs to be fragmented since it goes ...

we take the decision to set jumbo frame on all our linux machines we have hadoop cluster with master machines , workers machines and kafka machines our switches ( Cisco ) are suitable to Jumbo frame ...

When I test with Cisco 2960 series switches or with ISR routers, then if port receives an Ethernet frame larger than its MTU value seen in sh int output, then device drops this frame and increases the ...

How to set the correct MTU on OpenVPN server client connection ? The highest payload that can be successfully sent from here is 1402 from a Win7 PC. ping host -l 1402 -f Wireshark shows that the ...

What appropriate MTU size should be used in datacenter switches and routers? is there any standard or pros and cons? Default is 1500 but that isn't enough to push data. should we used 9000 MTU on ...

I am researching the throughput of my Cisco routers. For now I know that throughput depends from packet size and configured services like NAT or ACL filtering. My question is about packet size. For ...

What is the difference between tcp.len and data.len filters? I thought that both mean data size traveling in the segment (not including TCP header). I have a problem related to MTU issue and I'm ...

I'm confused as to the difference between maximum segment size and a maximum transmission unit. Can someone please explain in relation to layers 2 and 3? If I had a packet of 800 bytes in the ...

I am still not sure why the Ethernet data frame size / MTU was set maximum to 1500 bytes. I found out a document from Xerox which is from 1980. Available at (http://www.pennington.net/archives/...

Is it reasonable to set higher MTU size between RAN (3g, LTE) and RNC/SGW? Say, we have S1-U interface with GTP encapsulation, which leads to reduced data size for mobile user. Data size can be ...

I'm testing the frame size by adjusting it from 1500 to 9000 for the link to the storage NAS to optimize the 10 gigabit connection and have seen an increase of speed to almost 300% read speeds. I ...

We have two offices and i configured a site to site ipsec vpn. Most of the time the latency is high. looking on the internet, some suggests to change the MTU value on 1392. the largest packet that i ...

I set MTU of my NIC equal to 68 (the minimum MTU value for IPv4): ghasemi@ghasemi-MS-7693:~$ sudo ifconfig enp5s0 mtu 68 [sudo] password for ghasemi: ghasemi@ghasemi-MS-7693:~$ ghasemi@ghasemi-MS-...

I think I might be getting confused with terminology surrounding MTU. This definition from Wendell Odom's CCNA book on MTU: The IEEE 802.3 specification limits the data portion of the 802.3 frame ...

I could not find much information on option 26 ( MTU ) from the https://www.ietf.org/rfc/rfc2132.txt, I learned the bellow 2 points from the blog http://www.microhowto.info/howto/...

Having a tough time here getting EAP-TLS to work. I am converting from a EAP-PEAP solution to EAP-TLS and have done the steps required for PKI so as to be not a certificate issue. (server and client ...

I get only IPv6 address on my mobile phone connected to an LTE network. If I assume that OSI level2 packet size on LTE link is 1428 bytes what would be the max payload size for UDP packets that are ...

We want to enable 9K jumbo frame on CISCO WS-C2960X-24PS-L switches, however I found this line in the documentation and it made me confused and concerned because it involves reset and reload of switch ...

What is the 802.11 MTU?

1 answers, 2.873 views mtu
I keep reading it is 2304 bytes. Wikipedia states it is 7981 bytes. On my WiFi AP, I can set the RTS threshold with a value of 0-2346 bytes (I guess it's MTU + the MAC/PHY header ?) Where does this ...

I have a Cisco 3750X switch stack (2 switches stacked) and have a Compellent and three Equalogics as well as three VMware hosts directly connected but separated via different vLANs on this switch. The ...

Regarding clns mtu

1 answers, 163 views cisco-ios osi mtu is-is
I understand the below points,please confirm if my understanding is correct. MTU > MSS E.g if my MSS is 1460 bytes, then MTU should be at least 1500 bytes(20 bytes for IP header and 20 bytes for TCP ...

we can find the maximum packet size by the formula packet err rate = 1 - (1 - bit err rate)^(max packet size) so does this max packet size include the FEC bits? I assume this formula gives the max ...

Basically if the frame size of a packet is more than the MTU size configured in the router (which is an intermediate hop) the packet is dropped. Since IP does not have any ARQ mechanism, is there a ...

Changing MTU constantly

1 answers, 105 views linux mtu
I am building a custom layer 1 (using rf radios). I am building a tap/tun solution running on Linux on both sides of the radio link so I can get internet over my link. Due to the nature of radio ...

I'm currently investigating an unusual MTU issue. I have a server running Red Hat with a single interface which has an MTU of 1500. I have verified this by running netstat -i. When I packet capture ...

We have an L2 path between a tape drive and a NetApp. The path goes through 3 switches (a 6509 and two N5K) but the two devices are on the same VLAN. All 10 gig fiber. I found out that while most of ...

We are getting many IP Fragmentation attack. Our server only dealing with UDP RTP traffic so i wonder can we set don't fragment configuration so switch or cisco router port drop all packet instead of ...

I would like to enable the jumbo frame support on my N5k for specific SCSI trafic. I've read we can't do it per interface but only on the system itself : policy-map type network-qos JUMBO_MTU ...

According to RFC791: Every internet module must be able to forward a datagram of 68 octets without further fragmentation. This is because an internet header may be up to 60 octets, and the minimum ...

Assume we have a ethernet link with an MTU of 1300 bytes, while an application want to send 5200 bytes of data. How many fragments do we transmitted ? i would say 5, to send 5200 bytes over a link ...

I'm running IPSEC-VPN (AES256/SHA256/DH14) tunnel between a PaloAlto PA-500 and a Fortigate 110C via Internet (10MBit up/down guaranteed both sides - latency between 40 and 50ms). 90% connections are ...

It's very strange issue, on openstack cluster we have VxLAN between network and compute node and its using 1450 MTU (1500-50) because of encap header. Because of it some of my application not working ...

The maximum MTU I can set is between 9000 an 10,000 for a Ethernet interface. I have the following message for high values ifconfig eth0 mtu 10000 SIOCSIFMTU: Invalid argument What is the origin ...

Improved my calculation - based on the comments. However,I don't get the correct results yet. I am trying to find out the maximum number of stub LSA routes I can pass from one device to another ...

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