Hi,
I am running OpenWrt 19.07.9 on Linksys WRT1200AC.
I have a problem with my ISP not sending IPv6 Router Advertisement except as a response to Router Solicitation messages. The connection is a PPPoE and everything works initially, but after 30 minutes the the default route expires and IPv6 stops working. I can fix this by manually setting the route again, but I have not found an easy way to automate this.
With tcpdump I can see that when the wan6 link is restarted, openwrt sends out RS and the ISP responds with a RA message. IPv6 starts working again for 30 minutes. However this resets the connections, so it is not ideal.
Is there a way to get openwrt to send RS message at every DHCPv6 renew?
I found an old thread, which suggested using ndisc6 to send RS through a cronjob. Unfortunately I was not able to compile it (error below).
Any suggesting on possible solutions would be much appreciated!
src/trace-tcp.c: In function 'send_syn_probe':
src/trace-tcp.c:52:21: error: invalid application of 'sizeof' to incomplete type 'struct tcphdr'
if (plen < sizeof (struct tcphdr))
^~~~~~
src/trace-tcp.c:53:18: error: invalid application of 'sizeof' to incomplete type 'struct tcphdr'
plen = sizeof (struct tcphdr);
^~~~~~
In file included from src/trace-tcp.c:29:
src/trace-tcp.c:55:2: error: invalid application of '__alignof__' to incomplete type 'struct tcphdr'
alignas (struct tcphdr) char buf[plen];
^~~~~~~
src/trace-tcp.c:58:17: error: field 'th' has incomplete type
struct tcphdr th;
^~
src/trace-tcp.c:59:11: error: flexible array member in a struct with no named members
uint8_t payload[];
^~~~~~~
src/trace-tcp.c:67:24: error: 'TH_SYN' undeclared (first use in this function); did you mean 'TH_ECE'?
packet->th.th_flags = TH_SYN | (ecn ? (TH_ECE | TH_CWR) : 0);
^~~~~~
TH_ECE
src/trace-tcp.c:67:24: note: each undeclared identifier is reported only once for each function it appears in
src/trace-tcp.c: In function 'parse_syn_resp':
src/trace-tcp.c:81:21: error: dereferencing pointer to incomplete type 'const struct tcphdr'
if ((len < sizeof (*pth))
^~~~
src/trace-tcp.c:84:24: error: 'TH_ACK' undeclared (first use in this function); did you mean 'TH_ECE'?
|| ((pth->th_flags & TH_ACK) == 0)
^~~~~~
TH_ECE
src/trace-tcp.c:85:25: error: 'TH_SYN' undeclared (first use in this function); did you mean 'TH_ECE'?
|| (((pth->th_flags & TH_SYN) != 0) == ((pth->th_flags & TH_RST) != 0))
^~~~~~
TH_ECE
src/trace-tcp.c:85:60: error: 'TH_RST' undeclared (first use in this function); did you mean 'TH_ECE'?
|| (((pth->th_flags & TH_SYN) != 0) == ((pth->th_flags & TH_RST) != 0))
^~~~~~
TH_ECE
src/trace-tcp.c: In function 'parse_syn_error':
src/trace-tcp.c:107:10: error: dereferencing pointer to incomplete type 'const struct tcphdr'
|| (pth->th_sport != sport)
^~
src/trace-tcp.c: In function 'send_ack_probe':
src/trace-tcp.c:130:21: error: invalid application of 'sizeof' to incomplete type 'struct tcphdr'
if (plen < sizeof (struct tcphdr))
^~~~~~
src/trace-tcp.c:131:18: error: invalid application of 'sizeof' to incomplete type 'struct tcphdr'
plen = sizeof (struct tcphdr);
^~~~~~
In file included from src/trace-tcp.c:29:
src/trace-tcp.c:133:2: error: invalid application of '__alignof__' to incomplete type 'struct tcphdr'
alignas (struct tcphdr) char buf[plen];
^~~~~~~
src/trace-tcp.c:136:17: error: field 'th' has incomplete type
struct tcphdr th;
^~
src/trace-tcp.c:137:11: error: flexible array member in a struct with no named members
uint8_t payload[];
^~~~~~~
src/trace-tcp.c:145:24: error: 'TH_ACK' undeclared (first use in this function); did you mean 'TH_ECE'?
packet->th.th_flags = TH_ACK;
^~~~~~
TH_ECE
src/trace-tcp.c: In function 'parse_ack_resp':
src/trace-tcp.c:159:21: error: dereferencing pointer to incomplete type 'const struct tcphdr'
if ((len < sizeof (*pth))
^~~~
src/trace-tcp.c:162:23: error: 'TH_SYN' undeclared (first use in this function); did you mean 'TH_ECE'?
|| (pth->th_flags & TH_SYN)
^~~~~~
TH_ECE
src/trace-tcp.c:163:23: error: 'TH_ACK' undeclared (first use in this function); did you mean 'TH_ECE'?
|| (pth->th_flags & TH_ACK)
^~~~~~
TH_ECE
src/trace-tcp.c:164:24: error: 'TH_RST' undeclared (first use in this function); did you mean 'TH_ECE'?
|| ((pth->th_flags & TH_RST) == 0)
^~~~~~
TH_ECE
src/trace-tcp.c: In function 'parse_ack_error':
src/trace-tcp.c:186:10: error: dereferencing pointer to incomplete type 'const struct tcphdr'
|| (pth->th_sport != sport)
^~
