Date: Tue, 29 Apr 2008 05:02:09 -0700 From: Jeremy Chadwick <koitsu@freebsd.org> To: Sharad Chandra <sharadc@in.niksun.com> Cc: FreeBSD Hackers <freebsd-hackers@freebsd.org> Subject: Re: jumbo packets on em card. Message-ID: <20080429120209.GA44534@eos.sc1.parodius.com> In-Reply-To: <200804291613.14081.sharadc@in.niksun.com> References: <200804291613.14081.sharadc@in.niksun.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Tue, Apr 29, 2008 at 04:13:13PM +0530, Sharad Chandra wrote: > I am getting a problem in setting em card to 1000baseTX. It shows "active > status" with 100baseTX but as soon as i run "ifconfig em1 media 1000baseTX > mediaopt full-duplex", it says *no carrier*. how can i set it to 1000base? The PHYs support auto-negotiation of speed and duplex, as per the 802.3 standard. Do you have a gigabit switch? If so, does auto-negotiation (e.g. no "mediaopt" or "media" settings) work? If not, is the switch a managed switch? If so, try explicitly setting the port on the switch to 1000mbit, full duplex. If not, then consider buying another switch. Many consumer/residential switches do not do auto-negotiation properly, resulting in "no carrier" or worse (bad throughput). > And is it possible any how to send *jumbo packets* on this card or on bge card > (bge card is working with 1000base)? I tried nemesis tool, but i don't think > it can send bigger packets. BPF also seems to have limitaion upto 2K. man 4 em man 4 bge Keep in mind that if you use jumbo frames, your **entire network** needs to use jumbo frames. You cannot mix-and-match frame sizes. Chances are your ISPs or your co-lo provider doesn't support jumbo. -- | Jeremy Chadwick jdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20080429120209.GA44534>