<html> <head> <style></style></head> <body class='hmmessage'><div dir='ltr'>Hi, The problem is about the configuration of TUN/TAP. In my project, I have finished my script and successfully create tap0 and tap1. However, when I run my project in bochs(a emulator), it prompt a message "*** buffer overflow detected ***: bochs terminated" , which should be "tuntap network driver: opened /dev/net/tun:tap0 device" while the status of TUN/TAP is normal. I tried to find out what happened, but failed. Detail as blow: 1)I tried ”cat /dev/net/tun“ and its feedback is ”cat: /dev/net/tun: File descriptor in bad state“ 2)I tried "lsmod | grep tun". No information output. 3)I tried "modprobe tun". And then tried "lsmod | grep tun" again. The result is the same : No information output. 4)I check tap0, tap1 by the command of ifconfig. The information is blow(tap0 and tap1 is not RUNNING): ============================================================================= lo Link encap:本地环回 inet 地址:127.0.0.1 掩码:255.0.0.0 inet6 地址: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 跃点数:1 接收数据包:1496 错误:0 丢弃:0 过载:0 帧数:0 发送数据包:1496 错误:0 丢弃:0 过载:0 载波:0 碰撞:0 发送队列长度:0 接收字节:171417 (171.4 KB) 发送字节:171417 (171.4 KB) tap0 Link encap:以太网硬件地址 mac1 inet 地址:ip1 掩码:255.255.255.0 UP BROADCAST PROMISC MULTICAST MTU:1500 跃点数:1 接收数据包:0 错误:0 丢弃:0 过载:0 帧数:0 发送数据包:0 错误:0 丢弃:0 过载:0 载波:0 碰撞:0 发送队列长度:500 接收字节:0 (0.0 B) 发送字节:0 (0.0 B) tap1 Link encap:以太网硬件地址 mac2 inet 地址:ip2 掩码:255.255.255.0 UP BROADCAST PROMISC MULTICAST MTU:1500 跃点数:1 接收数据包:0 错误:0 丢弃:0 过载:0 帧数:0 发送数据包:0 错误:0 丢弃:0 过载:0 载波:0 碰撞:0 发送队列长度:500 接收字节:0 (0.0 B) 发送字节:0 (0.0 B) =============================================================================== Since the system can perform on another machine normally, the code of the project is ok. I think that maybe the TUN/TAP is not installed/configured correctly. Isn't it? Furthermore, some information of my project is blow: 1) OS : ubuntu12.04(newly install ubuntu12.04, not upgrade from a lower version) 2) have installed brctl and tunctl（sudo apt-get install uml-utilities bridge-util） 3) the version of boche is 2.5.1(--enable-pci --enable-ne2000 --enable-pnic) 4) the configuration of tuntap in the script of boche is : ne2k: enabled=1, ioaddr=0x300, irq=11, mac=11:22:33:44:55:66, ethmod=tuntap, ethdev=/dev/net/tun:tap0 pci: enabled=1, chipset=i440fx i440fxsupport: enabled=1, slot1=ne2k Finally, is all my configuration above correct? If yes, does that means some bugs within TUN/TAP? </div></body> </html>