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Martin Hope
Syn Romana
Asked: 2021-10-13 09:10:39 +0800 CST
  • 0

I got into weird issue with PPTP VPN. For some reason the same configuration works fine (I am able to connect) on Ubuntu 20.04 but it doesn't work in Debian 10 or 11. On Debian in the logs I am getting:

Oct 12 17:44:51 x pppd[567]: Connect: ppp0 <--> /dev/pts/1
Oct 12 17:44:51 x systemd-udevd[569]: ethtool: autonegotiation is unset or enabled, the speed and duplex are not writable.
Oct 12 17:44:51 x pptp[570]: anon log[main:pptp.c:353]: The synchronous pptp option is NOT activated
Oct 12 17:44:52 x pptp[579]: anon log[ctrlp_rep:pptp_ctrl.c:259]: Sent control packet type is 1 'Start-Control-Connection-Request'
Oct 12 17:44:52 x pptp[579]: anon log[ctrlp_disp:pptp_ctrl.c:781]: Received Start Control Connection Reply
Oct 12 17:44:52 x pptp[579]: anon log[ctrlp_disp:pptp_ctrl.c:815]: Client connection established.
Oct 12 17:44:52 x pppd[567]: sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x1346f064> <pcomp> <accomp>]
Oct 12 17:44:53 x pptp[579]: anon log[ctrlp_rep:pptp_ctrl.c:259]: Sent control packet type is 7 'Outgoing-Call-Request'
Oct 12 17:44:53 x pptp[579]: anon log[ctrlp_disp:pptp_ctrl.c:900]: Received Outgoing Call Reply.
Oct 12 17:44:53 x pptp[579]: anon log[ctrlp_disp:pptp_ctrl.c:939]: Outgoing call established (call ID 35522, peer's call ID 26496).
Oct 12 17:44:55 x pppd[567]: sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x1346f064> <pcomp> <accomp>]
Oct 12 17:44:58 x pppd[567]: sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x1346f064> <pcomp> <accomp>]
Oct 12 17:45:01 x pppd[567]: sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x1346f064> <pcomp> <accomp>]
Oct 12 17:45:04 x pppd[567]: sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x1346f064> <pcomp> <accomp>]
Oct 12 17:45:07 x pppd[567]: sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x1346f064> <pcomp> <accomp>]
Oct 12 17:45:10 x pppd[567]: sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x1346f064> <pcomp> <accomp>]
Oct 12 17:45:13 x pppd[567]: sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x1346f064> <pcomp> <accomp>]
Oct 12 17:45:16 x pppd[567]: sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x1346f064> <pcomp> <accomp>]
Oct 12 17:45:19 x pppd[567]: sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x1346f064> <pcomp> <accomp>]
Oct 12 17:45:22 x pppd[567]: LCP: timeout sending Config-Requests
Oct 12 17:45:22 x pppd[567]: Connection terminated.
Oct 12 17:45:22 x pppd[567]: Modem hangup

it is not a matter of loading nf_conntrack_pptp or nf_conntrack_proto_gre kernel modules

here is the config:

pty "pptp 1.2.3.4 --nolaunchpppd --debug"
name login
password password
remotename PPTP
#require-mppe-128
require-mschap-v2
refuse-eap
refuse-pap
refuse-chap
refuse-mschap
noauth
debug
persist
maxfail 0
defaultroute
replacedefaultroute
usepeerdns

any ideas?

vpn pptp pptp-client
Martin Hope
Syn Romana
Asked: 2021-01-05 04:00:11 +0800 CST
  • 1

I have simple awk command generating output and then sending an email:

awk '(NR==FNR){a[$2]=sprintf("%.2f",$1*value); next} {print $1,$2,a[$2]}' OFS="\t\t\t" value=$COST /tmp/1.txt /tmp/2.txt

however the last column is misaligned based on the second one:

510G                    /path/to/aaaaaaaaaaaaa/                 0.00
157G                    /path/to/bbbbbbbbb/                     0.00
253M                    /path/to/ccccccccccccccc/                        0.00
61M                     /path/to/dddddddd/                      0.00
16K                     /path/to/eeeee/                 0.00
8.0K                    /path/to/fffffffff/                     0.00

How can I enforce this to be always aligned? /path/to is static.

bash awk
Martin Hope
Syn Romana
Asked: 2020-12-17 10:12:36 +0800 CST
  • 1

I have weird problem with my Mailcow instance. One container (Postfix) has started resolving DNS partially. The problem is only with this particular container which I don't understand. It is causing that emails are not being sent from it due to domain name not found error.

root@6c751ea397ad:/# host wp.pl
Host wp.pl not found: 2(SERVFAIL)
root@6c751ea397ad:/# host mx.wp.pl
Host mx.wp.pl not found: 2(SERVFAIL)

root@6c751ea397ad:/# cat /etc/resolv.conf 
search domain.com
nameserver 127.0.0.11
options ndots:0

but with external DNS:

root@6c751ea397ad:/# host wp.pl 1.1.1.1
Using domain server:
Name: 1.1.1.1
Address: 1.1.1.1#53
Aliases: 

wp.pl has address 212.77.98.9
wp.pl mail is handled by 0 mx.wp.pl.
wp.pl mail is handled by 5 mx5.wp.pl.

for different domain:

root@6c751ea397ad:/# host -t any o2.pl             
o2.pl has address 212.77.98.29
o2.pl descriptive text "facebook-domain-verification=0omejgqroqocgh4efgrbu8bovlazni"
o2.pl descriptive text "v=spf1 include:wp.pl -all"
o2.pl mail is handled by 10 mx.tlen.pl.
o2.pl has SOA record ns1.go2.pl. root.go2.pl. 2020111002 3600 1080 1209600 7200
o2.pl name server ns1.go2.pl.
o2.pl name server ns2.go2.pl.
root@6c751ea397ad:/# host -t any mx.tlen.pl
mx.tlen.pl has address 193.222.135.150

This one is really weird:

root@6c751ea397ad:/# host -t any company.mail.protection.outlook.com 
Host company.mail.protection.outlook.com not found: 2(SERVFAIL)
root@6c751ea397ad:/# host -t any outlook.com 
outlook.com has SOA record bn7mgt0101dc013.prdmgt01.prod.exchangelabs.com. msnhst.microsoft.com. 2014796278 300 900 2419200 60
outlook.com has address 40.97.148.226
outlook.com has address 40.97.153.146
outlook.com has address 40.97.161.50
...

Each other container works fine:

root@c228923398e8:/# host wp.pl
wp.pl has address 212.77.98.9
wp.pl mail is handled by 5 mx5.wp.pl.
wp.pl mail is handled by 0 mx.wp.pl.
root@c228923398e8:/# host mx.wp.pl
mx.wp.pl has address 212.77.101.4
root@c228923398e8:/# cat /etc/resolv.conf 
search domain.com
nameserver 127.0.0.11
options ndots:0

I've tried so far:

  • removing and reinstalling resolvconf from the host
  • Adding 1.1.1.1/8.8.8.8 to /etc/resolvconf/resolv.conf.d/base and /etc/resolvconf/resolv.conf.d/head
  • Adding DNS to: /etc/docker/daemon.json
  • Adding static DNS to mailcow docker-compose
  • Disabling firewall

all without any luck.

linux postfix docker linux-networking
Martin Hope
Syn Romana
Asked: 2019-03-04 11:32:18 +0800 CST
  • 2

I have IPv6 tunnel (he.net) on my NAT router. I also have a simple firewall and routing setup to allow hosts behind the router to use IPv6 address space. Unfortunately only outgoing connectivity and incoming icmp works for these hosts.

#!/bin/bash
PUBIF="he-ipv6"
LOCIF="vmbr0"
echo "Starting IPv6 firewall..."
ip6tables -F
ip6tables -X
ip6tables -t mangle -F
ip6tables -t mangle -X

ip6tables -A INPUT -i lo -j ACCEPT
ip6tables -A OUTPUT -o lo -j ACCEPT

ip6tables -P INPUT DROP
ip6tables -P OUTPUT DROP
ip6tables -P FORWARD DROP

ip6tables -A INPUT -i $PUBIF -m state --state ESTABLISHED,RELATED -j ACCEPT
ip6tables -A OUTPUT -o $PUBIF -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT

ip6tables -A INPUT -m rt --rt-type 0 -j DROP
ip6tables -A FORWARD -m rt --rt-type 0 -j DROP
ip6tables -A OUTPUT -m rt --rt-type 0 -j DROP

ip6tables -A INPUT -s fe80::/10 -j ACCEPT
ip6tables -A OUTPUT -s fe80::/10 -j ACCEPT

ip6tables -A INPUT -d ff00::/8 -j ACCEPT
ip6tables -A OUTPUT -d ff00::/8 -j ACCEPT

ip6tables -A INPUT -i $LOCIF -j ACCEPT
ip6tables -A OUTPUT -o $LOCIF -j ACCEPT

ip6tables -A FORWARD -i $LOCIF -o $PUBIF -j ACCEPT
ip6tables -A FORWARD -i $PUBIF -o $LOCIF -p icmpv6 -j ACCEPT
ip6tables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT

ip6tables -A INPUT -i $PUBIF -p ipv6-icmp -j ACCEPT
ip6tables -A OUTPUT -o $PUBIF -p ipv6-icmp -j ACCEPT

ip6tables -A INPUT -i $PUBIF -p tcp --destination-port 65000 -j ACCEPT

ip6tables -A INPUT -i $PUBIF -j LOG
ip6tables -A INPUT -i $PUBIF -j DROP

What did I miss here?

iptables