# Seeking howto set "low latency" via bootp for EL-162 **URL:** \ **Category:** Realport\ **Created:** [March 1, 2005, 2:10pm UTC](https://forums.digi.com/t/seeking-howto-set-low-latency-via-bootp-for-el-162/7248 "2005-03-01T14:10:26Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![jowel](https://avatars.discourse-cdn.com/v4/letter/j/7ba0ec/32.png) [@jowel](https://forums.digi.com/u/jowel)\ **Post date:** [March 1, 2005, 2:10pm UTC](https://forums.digi.com/t/seeking-howto-set-low-latency-via-bootp-for-el-162/7248/1 "2005-03-01T14:10:26Z")
## I’am able to load successfully new FW via bootp/tftboot to the device, but still need more detailed info about how to switch to low latency" via bootp. The doku says: There is one new bootp/dhcp vendor specific option for optimization: VS\_OPTIMIZE = 8 ## This option takes a two byte value, in network byte order, 0 to optimize for throughput and 1 to optimize for latency. For example, in hexadecimal, the vendor option 08 02 00 01 optimizes for low latency. But how to create the according line in the bootptab ? I tried: vm=0x08020001: but without success. I can verify with network analyzer etheral that “Bootp vendor specific options” 08 02 00 01 are beeing sent with additional trailing bytes: 35 01 01 2b 0f 04 04 ac 1f 01 67 05 07 45 4c 2d 31 36 32 00 37 03 2b 01 03 ff and 34 padding zero bytes. But rlogin “ver” command still reveals “Optimize: throughput” What’s going wrong here ? Any help very much appreciated ! Joachim