Cant Ping with packets with MTU larger than 1518 Bytes
|
Bookmark this page:
 Yahoo!
 Google
 Windows Live
 del.icio.us
 digg
 Netscape
|
|
||||||||||
|
Posted by wilowolf on May 24, 2009, 12:32 am
Please log in for more thread options
I have two routers connected connected back to back with an Ethernet cable. I set MTU size on bother GigaEthernet intefaces to 1524 yet, when the routers cant ping each with packets of size more than 1518 when set the DF on. Any hint ? | ||||||||||
|
Posted by bod43 on May 24, 2009, 7:01 am
Please log in for more thread options  There is no standard for a ping program. The size specified as a parameter to the ping command may not be the "ethernet" packet length. It may be - Frame length with CRC - default for ethernet is 1518 Frame length without the CRC - 1514 IP packet total length - 1500 IP packet total length less the IP header ICMP payload length - ? Some other number the designer fancied at the time It may also vary (and does if I recall correctly) with the exact ping program being used. Cisco router one being different from Windows one I suspect. I always just check with wireshark on a PC. I seem to recall that on Windows you specify -l 1472 to get a maximal length ethernet packet (however that may well be incorrect). This I guess will be the ICMP payload length. | ||||||||||
|
Posted by Aaron Leonard on May 26, 2009, 6:28 pm
Please log in for more thread options ~ I have two routers connected connected back to back with an Ethernet~ cable. I set MTU size on bother GigaEthernet intefaces to 1524 yet, ~ when the routers cant ping each with packets of size more than 1518 ~ when set the DF on. Any hint ? Both mtu and ip mtu are boosted, yes? | ||||||||||
| Similar Threads | Posted |
| Cant Ping with packets with MTU larger than 1518 Bytes | May 24, 2009, 12:32 am |
| Ratio of Bytes Delayed to Bytes Sent | December 21, 2005, 3:08 pm |
| Pix & large ping packets | May 3, 2007, 9:58 am |
| PIX VPN tunnel 0 bytes TX! | July 28, 2006, 4:40 am |
| Convert bytes to MB on cisco router | March 29, 2006, 3:59 pm |
| Input & Output bytes question | April 23, 2007, 8:24 pm |
| Priority Queue - Bytes, Kilobits Etc | October 8, 2007, 12:16 pm |
| MTU less than 1500 bytes on Cisco layer 3 switch | October 25, 2005, 7:18 am |
| Cisco 851/%SYS-2-MALLOCFAIL: Memory allocation of 65536 bytes failed | December 26, 2008, 10:28 am |
| VRRP : I am unable to ping the virtual address, I can only ping the backup addresses. | November 12, 2008, 3:16 pm |
| Oversize packets | July 14, 2005, 2:06 am |
| PIX 515 doesn't route packets | July 19, 2005, 5:58 pm |
| PIX: How are packets travelling through it? | July 29, 2005, 10:46 pm |
| debug packets on PIX with 7.0 | October 11, 2005, 12:19 am |
| Can't receive VPN packets | December 7, 2005, 11:33 am |
|
Home Cabling Guide
Finally, an instantly downloadable book that saves you thousands in home improvement dollars! Enjoy living in 21st century technology-advanced home while increasing its selling value and competitive advantage on the real estate market. Whether your cabling is for home office or high-tech leisure, you can wire your home yourself or learn "wirish" to speak with your cabling contractors in their language! Click Here to learn more |
> I have two routers connected connected back to back with an Ethernet
> cable. I set MTU size on bother GigaEthernet intefaces to 1524 yet,
> when the routers cant ping each with packets of size more than 1518
> when set the DF on. Any hint ?