On 9/16/15, AR, Giridhar <giridhar.raja...@netapp.com> wrote: > Hi Lee, > > Thanks for the response. > No I didn't change the MTU on every router and switches between client and > server. > >>What is the relation between MTU and max_repetitions.? >> If we change the MTU to jumbo frame like 9000, what should be these >> macros (SNMP_MAX_MSG_SIZE , SNMP_MAX_LEN ) should be set ? >> Is there any other changes in need to perform? > > Do you have any inputs on the above questions?
Don't change the MTU. If you do, and don't change the MTU on your routers & switches, anything you send > 1500 bytes will be dropped. I'm not exactly sure what you're trying to accomplish, but if I was trying to change how much info could be returned I'd start with changing SNMP_MAX_MSG_SIZE and see if that worked. Regards, Lee > > Thanks > Giridhar > > -----Original Message----- > From: Lee [mailto:ler...@gmail.com] > Sent: Wednesday, September 16, 2015 5:13 PM > To: AR, Giridhar > Cc: net-snmp-coders@lists.sourceforge.net > Subject: Re: guidelines to increase the MTU size > > On 9/16/15, AR, Giridhar <giridhar.raja...@netapp.com> wrote: >> Hi >> >> Need guidelines to increase the MTU size (example from 1500 to 9000) >> Our application is using snmpv2. When the MTU size (9000) is changed >> on interface of client and server, Snmp queries are timed out. > > Did you also change the MTU on every router & switch between the client and > server to be 9000? If no, that's probably why queries are timing out > > Regards, > Lee > > >> We collected the packet traces on both client and server. Client is >> receiving the response from server, but client is dropping the packet. >> Following are the test cases tried >> >> case client MTU server MTU >> result >> >> 1 1500 1500 >> passed >> >> 2 1500 9000 >> failed >> >> 3 9000 1500 >> passed >> >> 4 9000 9000 >> failed >> >> >> Looked at the client code, uses the net-snmp-code, >> >> >> >> #define SNMP_MAX_MSG_SIZE 1472 >> #define SNMP_MAX_LEN 1500 >> >> And by default max_repetitions is set 20. If we set to 1, snmp queries >> are successful. >> >> What is the relation between MTU and max_repetitions.? >> If we change the MTU to jumbo frame like 9000, what should be these >> macros (SNMP_MAX_MSG_SIZE , SNMP_MAX_LEN ) should be set ? >> Is there any other changes in need to perform? >> >> >> Thanks >> Giridhar >> >> >> >> >> >> > ------------------------------------------------------------------------------ Monitor Your Dynamic Infrastructure at Any Scale With Datadog! Get real-time metrics from all of your servers, apps and tools in one place. SourceForge users - Click here to start your Free Trial of Datadog now! http://pubads.g.doubleclick.net/gampad/clk?id=241902991&iu=/4140 _______________________________________________ Net-snmp-coders mailing list Net-snmp-coders@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/net-snmp-coders
