dhcpcd-discuss

Receiving the RA's does not cause icmpv6_rcv() to be called when I try to use DHCP.

If I statically configure the IPv6 address:
# ifconfig eth1                                                                                                                                                                                                  
eth1      Link encap:Ethernet  HWaddr 54:39:68:0D:4B:F3                                                                                                                                                          
          inet6 addr: fe80::5639:68ff:fe0d:4bf3/64 Scope:Link                                                                                                                                                    
          inet6 addr: 3000::100/64 Scope:Global                                                                                                                                                                  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1                                                                                                                                                             
          RX packets:71 errors:0 dropped:0 overruns:0 frame:0                                                                                                                                                    
          TX packets:109 errors:0 dropped:0 overruns:0 carrier:0                                                                                                                                                 
          collisions:0 txqueuelen:0    

I can ping the interface:
#  ping6 -I eth1 FF02::2                                                                                                                                                                                         
PING FF02::2(ff02::2) from fe80::5639:68ff:fe0d:4bf3 eth1: 56 data bytes                                                                                                                                         
64 bytes from fe80::5639:68ff:fe0d:4bf3: icmp_seq=1 ttl=64 time=0.166 ms                                                                                                                                         
64 bytes from fe80::5639:68ff:fe0d:4bf3: icmp_seq=2 ttl=64 time=0.141 ms                                                                                                                                         
64 bytes from fe80::5639:68ff:fe0d:4bf3: icmp_seq=3 ttl=64 time=0.142 ms                                                                                                                                         
                                                                                                                                                                                                                
--- FF02::2 ping statistics ---                                                                                                                                                                                  
3 packets transmitted, 3 received, 0% packet loss, time 1998ms                                                                                                                                                   
rtt min/avg/max/mdev = 0.141/0.149/0.166/0.018 ms

If I use DHCP:
# ifconfig eth1                                                                                                                                                                                                  
eth1      Link encap:Ethernet  HWaddr 54:39:68:0D:4B:F3                                                                                                                                                          
          inet6 addr: fe80::5639:68ff:fe0d:4bf3/64 Scope:Link                                                                                                                                                    
          UP BROADCAST MULTICAST  MTU:1500  Metric:1                                                                                                                                                             
          RX packets:71 errors:0 dropped:0 overruns:0 frame:0                                                                                                                                                    
          TX packets:109 errors:0 dropped:0 overruns:0 carrier:0                                                                                                                                                 
          collisions:0 txqueuelen:0  

I cannot ping the interface:
#  ping6 -I eth1 FF02::2                                                                                                                                                                                         
PING FF02::2(ff02::2) from fe80::5639:68ff:fe0d:4bf3 eth1: 56 data bytes                                                                                                                                         
                                                                                                                                                                                                                
--- FF02::2 ping statistics ---                                                                                                                                                                                  
5 packets transmitted, 0 received, 100% packet loss, time 4006ms    



 

 

-----Original Message-----
From: jobhunts02 <jobhunts02@xxxxxxx>
To: Roy Marples <roy@xxxxxxxxxxxx>
Cc: dhcpcd-discuss <dhcpcd-discuss@xxxxxxxxxxxx>
Sent: Tue, Jan 23, 2018 4:42 pm
Subject: Re: [dhcpcd-discuss] Router Advertisements Ignored

I have flushed all the ip6tables rules and dhcpcd is still not seeing the RA’s.  Any suggestions where to look for the RA’s being dropped?

Thank you.

> On Jan 20, 2018, at 3:05 AM, Roy Marples <roy@xxxxxxxxxxxx> wrote:
> 
>> On 20/01/2018 01:06, Roy Marples wrote:
>>> On 19/01/2018 23:50, jobhunts02@xxxxxxx wrote:
>>> According to tcpdump, I am receiving router advertisements in response to my router solicitations (see below), but dhcpcd.log reports "eth1: no IPv6 Routers available."
> 
> Thanks for sending the log and binary capture off list.
> Here are two issues from the log:
> 
> eth1: if_disable_autolinklocal: Operation not supported
> This implies a mismatched kernel with your source headers or something like grsec. It's not really important, dhcpcd should still work fine.
> 
> dhcpcd already running on pid 9521 (/var/run/dhcpcd-eth1.pid)
> Something is trying to start dhcpcd in the background a lot. What are you using to start dhcpcd?
> 
> The binary capture itself is fine - I loaded it up in a test dhcpcd and it gave me an address and route as if from your router.
> So there is something in the way of dhcpcd and the packet - most likely a firewall.
> 
> Roy