44net

44net@mailman.ampr.org

3 participants
3172 discussions

by Brian Kantor

The Register reports a Linux/Android kernel flaw that could expose you to remote privileged execution of arbitrary code: http://www.theregister.co.uk/2017/04/14/new_critical_linux_kernel_flaw/ As a lot of the machines and routers on the Amprnet are based on Linux, this may be incentive for you to update to the latest kernel. - Brian

7 years, 9 months

Re: [44net] UCSD gateway outage

by Rob Janssen

> During the night, amprgw fetched a copy of the encap file from the portal > which was truncated (it had 259 entries instead of over 600) and one of > the entries that was in the copy fetched had no gateway address. Viz: > route addprivate 44.131.168.128/29 encap > This caused the ipip daemon to segfault and so there was no routing > between Internet and tunnel subnets for an hour. For this particular issue it would help when the encap file had a trailer that the script that fetches it could check for before loading it. Something like: # EOF Rob

7 years, 9 months

DNS

by Marc Williams

So that time has come to get some DNS entries added.G1FEF seems to be my coordinator. Should I approach him about entries I cannot spot a contact address anywhere. Regards Marc (2W0PNT)

7 years, 9 months

Portal down

by Marc Williams

The ampr portal is down for me here in the UK. Anyone else seeing an issue? Regards Marc (2W0PNT)

7 years, 9 months

Small corrections and a bug fix: ampr-ripd 1.6.2 and amprd 1.6

by Marius Petrescu

Hello, I made some small fixes without major functional impact to ampr-ripd: - Routes where not cleaned up in debug mode, after hitting CTRL-C - If RIP forwarding was used and the forward interface became inactive/disappeared, the daemon would not be able to send any RIP updates. This use case can occur e.g. if ampr-ripd is providing RIP broadcasts for a jnos via a tunnel. On jnos crash the tunnel would fail and would not receive route updates after restart (tnx. Gus, I0OJJ for report and testing the fix). If these issues have not bothered you until now, there is no urge to upgrade. There was also a bug in amprd, which would not set the needed host routes if rip_set_routes was set to 'no'. Also, the password is hard coded in amprd, too (like in ampr-ripd). Sooo: http://www.yo2loj.ro/hamprojects/ampr-ripd-1.16.2.tgz http://www.yo2loj.ro/hamprojects/amprd-1.6.tgz http://yo2tm.ampr.org/hamprojects/ampr-ripd-1.16.2.tgz http://yo2tm.ampr.org/hamprojects/amprd-1.6.tgz Have fun! Marius, YO2LOJ

7 years, 9 months

Re: [44net] New ampr-ripd 1.16 and amprd 1.5 released

by Rob Janssen

> I've sorted the source address and am now originating with a source > address of 44.131.14.255. Now I can ping those two other mentioned addresses > I guess this also highlights another issue, does anyone have a pointer > to the correct way to set up filters for this? I have added some quick > rules to prevent my gateway being a public IP relay, but it looks like > many others have not. I am not sure the correct way to configure these > filters for the general use case. I should now be discarding all > packets that don't have a source or destination within my network, but > I do not check for spoofing beyond that. This should be "good enough"? > Clearly, others have gone further. Well, what I have done up to now is a filter to allow IPIP traffic only from registered IPIP tunnel hosts, but no further. There is no strict "reverse path" checking yet, so anyone with a registered tunnel could in fact spoof traffic for any source IP. Maybe I'll fix that later, but for now I decide to allow traffic that may be routed somewhere else and then forwarded in a tunnel. The main purpose of the filter is to keep out the opportunists on Internet that could try to get around a firewall using tricky tunneled packets, not to regulate what the AMPRnet users can do. (I have seen examples of unwanted IPIP traffic, and lately GRE is a popular target as well, so similar filters are in place to allow GRE only from locally registered GRE endpoints) The filter is done as a -x script called by ampr-ripd when it updates the route table. The script is like this: #!/bin/sh # script called when ampr-ripd updates route table # load encap.txt into ipipfilter list AMPRGW="169.228.66.251" gwfile="/dev/shm/gw" cd /var/lib/ampr-ripd || exit 1 grep addprivate encap.txt | sed -e 's/.*encap //' | sort -u >$gwfile if iptables -N ipipfilter 2>/dev/null then iptables -F ipipfilter iptables -A ipipfilter -s $AMPRGW -j ACCEPT while read ip do iptables -A ipipfilter -s $ip -j ACCEPT done <$gwfile iptables -A ipipfilter -j LOGREJECT else iptables -L ipipfilter -n | grep ACCEPT | fgrep -v $AMPRGW | \ sed -e 's/.*-- //' -e 's/ .*//' | sort | diff - $gwfile | \ while read d ip do case "$d" in ">") iptables -I ipipfilter -s $ip -j ACCEPT ;; "<") iptables -D ipipfilter -s $ip -j ACCEPT ;; *) ;; esac done fi rm -f $gwfile This updates the "ipipfilter" chain that is used in the input firewall like this: iptables -A firewall -p 4 -j ipipfilter I use this method to have some statistics of traffic per endpoint as well, when you don't need that it would be better to use ipset to maintain an address set to be matched by a single iptables line. Rob

7 years, 9 months

Re: [44net] New ampr-ripd 1.16 and amprd 1.5 released

by Rob Janssen

> If you want to test it, 44.131.14.254 is a second loopback on the > gateway that is used for status monitoring. 44.131.14.192 is a unicast > node "inside" my network to check end to end connectivity. Your network is OK in our routing table. I can ping 44.131.14.255 but not those other addresses. Rob

7 years, 9 months

New ampr-ripd 1.16 and amprd 1.5 released

by Marius Petrescu

Hello! Today I released an update to ampr-ripd (1.16) and amprd (1.5) to support ipip encapsulation on subnets which have their endpoints BGP announced in the 44net space. Just compile and replace your current daemon executable file (stop the old one first). No changes in configuration should be necessary. Get them as usual from my ham project page: Internet: http://www.yo2loj.ro/hamprojects/ampr-ripd-1.16.tgz http://www.yo2loj.ro/hamprojects/amprd-1.5.tgz 44net: http://yo2tm.ampr.org/hamprojects/ampr-ripd-1.16.tgz http://yo2tm.ampr.org/hamprojects/amprd-1.5.tgz 73 de Marius, YO2LOJ

7 years, 9 months

Re: [44net] New ampr-ripd 1.16 and amprd 1.5 released

by Rob Janssen

> Can you ping .254? .255 should go direct and .254 should be > encapsulated to the same machine. No > Do you have an address I can test to? I have been doing a few tests > and it would appear that there are some issues here. 44.137.0.1 should be fine, and 44.137.41.97 as well > Previously I was able to access services that were public the same as > an external host, but now many of those are not working. As an example > 44.137.0.1 works fine from an external IP address, but not a > 44.131.14/24 one. I have found at least 1 host responding to my > encapsulated packets with ICMP Administratively Denied, which makes me > suspect that the problem is actually my anycast setup with my source > address not matching the gateway address. It is. Now I see what is wrong, the firewall log is full of: Apr 6 19:47:01 Packet REJECT: IN=eth0 OUT= SRC=45.63.97.98 DST=213.222.29.194 LEN=104 TOS=0x00 PREC=0x00 TTL=52 ID=19182 DF PROTO=4 That source address apparently belongs to you but it is not the tunnel endpoint. We reject all protocol 4 traffic from hosts not in the RIP broadcast for tunnels. Rob

7 years, 9 months

Re: [44net] Gatway up

by Rob Janssen

> We do this for a large percentage of our customers without issue. We route public subnets to customer specific firewalls which then translate those addresses to internal hosts: You are doing NAT. I know this is customary in commercial internet practice but in HAMNET/AMPRnet we don't like NAT. (too much time is wasted by debugging the issues caused by inserting NAT into networks that also have direct routing) Rob

7 years, 9 months

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