You are very close. Compare the token /// in the error message and your token: //.
Your version of ettercap is just IPv6 enabled. Hence the target definition gets one more part for the IPv6 address.
If you reread the man page and not just copy & paste the examples, then you should recognise the note about the target notation implication in regard to IPv6.

Thank you. This command now woks:

ettercap -T -i eth0 -M arp:remote /192.168.1.1// /192.168.1.9//

I should probably nag about making the software more tolerant in this case, but it's a hacking software and bits like these are probably intended to fend off noobs. So keep it please.

Very much appreciated.
Thank you.

Sorry to up an old topic but is it possible to disable IPv6 for ettercap and use IPv4 instead ?

@koeppea i am using vmware 12 to run kali linux 32bit, ettercap version 0.8.2 i want to run the mitm attack with nossl. so i type "ettercap -T -i -S eth0 -M arp:remote /192.168.1.1// /192.168.1.9//". But error happens, TARGET (eth0) contains invalid chars!.

HELP ME PLS

@blackcatlover
ettercap -T -i eth0 -S -M arp:remote /192.168.1.1// /192.168.1.9//

@sgeto i type it, and then i run another terminal "driftnet -i eth0" the victim is not facing the "no internet connection" error anymore, but the driftnet is still not receiving any images

Sorry, I don't use driftnet.
Maybe you can't see them because the images are transferred over a secure channel/protocol or maybe driftnet just sucks.
nossl is not exactly up-to-date either

@sgeto so what do u suggest me to do if i want to do a mitm attack to receive images of victim browsing? i face the ssl certification, and victim browser lost connection when i run the attack.

wish it was that easy.
there aren't many stealthy way left to sniff ssl traffic these days. if that's what you're after.
the few there are require certain know-how and dedication.
if you don't care about whether you victim notices the interception, you might want to have a look at the sslstip plugin.

我看了上一篇文章说不指定对象，它就会劫持全局，命令为：
ettercap -i eth0 -T -M arp：remote /10.0.0.1/ //
//所指对象为空但是这样会导致说令牌数量不对。

@HUC-jingzi Sorry my Chinese (Google Translate) is not that good.
However when IPv6 support is included at compile time, you have to use this command:

ettercap -i eth0 -T -M arp:remote /10.0.0.1// ///

If you still have issues, feel free to open a new issue (in English please).

@ HUC-jingzi对不起，我的中文（Google Translate）不好。
但是，在编译时包含IPv6支持时，您必须使用以下命令：

ettercap -i eth0 -T -M arp:remote /10.0.0.1// ///

如果仍然有问题，请随时打开一个新的问题（请用英语）。

Thank you very much for your answers! With your help, it succeeded. Praise you 6666 in Chinese (very good. Very powerful)！！Thinks very much