Comments (27)
zenozeng
commented on September 5, 2024
好像是因为 ppp dead
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zenozeng
commented on September 5, 2024
在 1.2.5, 1.3.1 以及 1.3.6 重现 (Linux OpenWrt 3.3.8 #74 Sun Jun 23 12:52:20 CST 2013 mips GNU/Linux)
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Senorsen
commented on September 5, 2024
如果尝试换用不同的L2TP服务器，是否还能重现问题？
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zenozeng
commented on September 5, 2024
但是在我的机子上不会有任何问题呀？
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Senorsen
commented on September 5, 2024
对，在我的路由器上也是有这个问题的，换用不同的L2TP服务器似乎才能将就解决。
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zenozeng
commented on September 5, 2024
我试试。
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zenozeng
commented on September 5, 2024
没用呀，小森森。
default
nexthop dev ppp0 weight 1 dead
nexthop dev ppp1 weight 1
10.0.0.0/8 via 10.76.8.1 dev eth0.2
10.5.1.0/24 via 10.76.8.1 dev eth0.2
10.5.1.5 dev ppp1 proto kernel scope link src 222.205.22.137
10.10.0.0/24 via 10.76.8.1 dev eth0.2
10.76.8.0/24 dev eth0.2 proto kernel scope link src 10.76.8.61
10.189.0.0/20 dev wlan1 proto kernel scope link src 10.189.5.4
10.189.128.0/20 dev wlan0-1 proto kernel scope link src 10.189.143.227
58.196.192.0/19 via 10.76.8.1 dev eth0.2
58.196.224.0/20 via 10.76.8.1 dev eth0.2
58.200.100.0/24 via 10.76.8.1 dev eth0.2
192.168.1.0/24 dev br-lan proto kernel scope link src 192.168.1.1
210.32.0.0/20 via 10.76.8.1 dev eth0.2
210.32.128.0/19 via 10.76.8.1 dev eth0.2
210.32.160.0/21 via 10.76.8.1 dev eth0.2
210.32.168.0/22 via 10.76.8.1 dev eth0.2
210.32.172.0/23 via 10.76.8.1 dev eth0.2
210.32.176.0/20 via 10.76.8.1 dev eth0.2
222.205.0.0/17 via 10.76.8.1 dev eth0.2
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Hexcles
commented on September 5, 2024
I once came across this problem. Please check the following:
can you see a "10.5.1.5 (or 7 or 9) dev ppp0" route right after dialing up?
This damn auto route causes the problem. All VPN data goes thru this channel, causing some kind of dead loop. I don't know why ZJU L2TP server will cause this kind of route, not happening in other L2TP VPNs.
The solution is:
ip route flush 10.5.1.0/24
immediately after the dialing up!
P.S. This behaviour happens only in some system and some xl2tpd version.
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zenozeng
commented on September 5, 2024
Yeah, I see this right after dialing up:
10.5.1.5 dev ppp1 proto kernel scope link src 222.205.22.170
10.5.1.7 dev ppp0 proto kernel scope link src 222.205.111.220
10.5.6.2 dev ppp6 proto kernel scope link src 222.205.26.91
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Hexcles
commented on September 5, 2024
10.5.1.5 should be fine (kind of peer link in L2TP).
But the 10.5.1.7 is absolutely wrong.
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zenozeng
commented on September 5, 2024
@Hexcles Thanks! It works!
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zenozeng
commented on September 5, 2024
cache
inet 222.205.23.89 peer 10.5.1.5/32 scope global ppp0
inet 222.205.23.90 peer 10.5.1.5/32 scope global ppp1
10.5.1.5 via 10.76.8.1 dev eth0.2 src 10.76.8.61
cache
10.5.1.7 via 10.76.8.1 dev eth0.2 src 10.76.8.61
cache
10.5.1.9 via 10.76.8.1 dev eth0.2 src 10.76.8.61
cache
inet 222.205.23.90 peer 10.5.1.5/32 scope global ppp1
10.5.1.5 via 10.76.8.1 dev eth0.2 src 10.76.8.61
cache
10.5.1.7 via 10.76.8.1 dev eth0.2 src 10.76.8.61
cache
10.5.1.9 via 10.76.8.1 dev eth0.2 src 10.76.8.61
cache ipid 0xeb25
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zenozeng
commented on September 5, 2024
又错了，上面那个是ppp0消失分界时的log
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zenozeng
commented on September 5, 2024
local IP address 222.205.23.90
remote IP address 10.5.1.5
No response to 5 echo-requests
Serial link appears to be disconnected.
Connect time 0.3 minutes.
Sent 0 bytes, received 0 bytes.
Terminating on signal 15
Connection terminated.
Modem hangup
L2TP的log
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zenozeng
commented on September 5, 2024
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zenozeng
commented on September 5, 2024
root@OpenWrt:~# cat /etc/ppp/options
#debug
logfile /dev/null
noipdefault
noaccomp
nopcomp
nocrtscts
lock
maxfail 0
lcp-echo-failure 50
lcp-echo-interval 1
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zenozeng
commented on September 5, 2024
还是挂了，这是这次比较慢。
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zenozeng
commented on September 5, 2024
No response to 50 echo-requests
Serial link appears to be disconnected.
Connect time 1.0 minutes.
Sent 8278 bytes, received 40 bytes.
Terminating on signal 15
Connection terminated.
Modem hangup
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Hexcles
commented on September 5, 2024
看起来还是同一个原因。拨号成功后（即ppp0出现后）把10.5.1.0/24 dev ppp0全都删掉试试看？
Sent from my cellphone.
On 30 Sep 2014 12:31, "Zeno Zeng" [email protected] wrote:
No response to 50 echo-requests
Serial link appears to be disconnected.
Connect time 1.0 minutes.
Sent 8278 bytes, received 40 bytes.
Terminating on signal 15
Connection terminated.
Modem hangup—
Reply to this email directly or view it on GitHub
#39 (comment).
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zenozeng
commented on September 5, 2024
50%的概率会丢包。而且这个非常奇怪只在播了ppp0再拨ppp1时会发生这个。
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zenozeng
commented on September 5, 2024
现在的路由表：
default
nexthop dev ppp2 weight 1
nexthop dev ppp0 weight 1
10.0.0.0/8 via 10.76.8.1 dev eth0.2
10.5.1.0/24 via 10.76.8.1 dev eth0.2
10.10.0.0/24 via 10.76.8.1 dev eth0.2
10.76.8.0/24 dev eth0.2 proto kernel scope link src 10.76.8.61
10.189.0.0/20 dev wlan1 proto kernel scope link src 10.189.5.4
10.189.128.0/20 dev wlan0-1 proto kernel scope link src 10.189.143.227
58.196.192.0/19 via 10.76.8.1 dev eth0.2
58.196.224.0/20 via 10.76.8.1 dev eth0.2
58.200.100.0/24 via 10.76.8.1 dev eth0.2
192.168.1.0/24 dev br-lan proto kernel scope link src 192.168.1.1
210.32.0.0/20 via 10.76.8.1 dev eth0.2
210.32.128.0/19 via 10.76.8.1 dev eth0.2
210.32.160.0/21 via 10.76.8.1 dev eth0.2
210.32.168.0/22 via 10.76.8.1 dev eth0.2
210.32.172.0/23 via 10.76.8.1 dev eth0.2
210.32.176.0/20 via 10.76.8.1 dev eth0.2
222.205.0.0/17 via 10.76.8.1 dev eth0.2
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zenozeng
commented on September 5, 2024
似乎一端时间之后就会好，不知道为什么。
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zenozeng
commented on September 5, 2024
先睡了，四点了，明天再说。
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zenozeng
commented on September 5, 2024
ip route get 10.5.1.5
10.5.1.5 via 10.76.8.1 dev eth0.2 src 10.76.8.61
cache
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zenozeng
commented on September 5, 2024
还是丢包
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zenozeng
commented on September 5, 2024
似乎和网站有关。ping t.cn 就不丢包。
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zenozeng
commented on September 5, 2024
囧 似乎其实已经好了？2 ZJUWLAN 迅雷 1.3 MB/s
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Related Issues (20)
- 不考虑加个使用说明？ HOT 3
- 将 MTU 降至 1428 或以下
- Fail to bring up ppp, timeout. HOT 1
- Please Help!! Fail to bring up PPP,time out HOT 4
- 经常发生断流的情况，而且连上网都困难 HOT 1
- Fail to bring up ppp, timeout. HOT 18
- Imperfect error handling
- can't use ssr server after connected to zjunet vpn HOT 1
- GPG error: The following signatures were invalid HOT 3
- 网址失效了 HOT 3
- Centos 8支持 HOT 1
- openwrt HOT 1
- WLAN.sh已不能使用 HOT 5
- 无法访问https://dl.zjuqsc.com/linux/ HOT 4
- Autoconnect upon system started
- cat: /var/run/ppp-zju-l2tp-[my account].pid: 没有那个文件或目录 HOT 2
- 装好了VPN，登录失败
- xl2tpd无法start，Failed to start Level 2 Tunnel Protocol Daemon (L2TP) HOT 1
- 域名未备案 HOT 2
- 无法使用clash代理
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