[NDP] len=0

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#网络协议

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【openwrt】openwrt21.02 dhcpv6 Stateless Vs Stateful Vs Stateless & Stateful配置说明
wgl307293845的博客
01-31 309
Configuration for DHCPv4, DHCPv6, RA and NDP services. openwrt-21.02 dhcpv6配置 Stateless 模式 M=0 O=1 ra_slaac=1 M=1 O=1 ra_slaac=0 Stateless & Statefull模式 M=1 O=1 ra_slaac=1
11.NDP协议分析与实践
百里奔跑
12-27 6378
NDP 协议分析与实践 1. 概述 1.1 简介 Neighbor Discovery Protocol 基于 ICMPv6 实现，用于替代 IPv4 中的 ARP 和 ICMP 路由器发现 基于 ICMPv6 实现节点发现(主机和路由)、重复地址检测、地址解析、邻居不可达检测和重定向等功能 1.2 NDP 报文格式 1.2.1 路由器请求 RS (Router Solicitations) ...
NDP拦截（NS）和响应（NA）
渣渣fei
08-11 1242
在IPv6网络中，由于没有ARP（Address Resolution Protocol）包，节点之间无法直接通过MAC地址进行通信。为了解决这个问题，IPv6引入了NDP包来提供类似的功能。NDP（Neighbor Discovery Protocol）是一种用于IPv6网络中的邻居发现协议，它允许IPv6节点发现并与其邻居节点建立连接。NDP协议在IPv6网络中起着重要的作用，它提供了 邻居发现、邻居解析、邻居缓存、邻居无效检测、路由重定向等功能。
AI智能棋盘搭载Syntiant NDP120实现超低功耗语音AI
weixin_35189483的博客
11-07 590
Syntient NDP120芯片通过专用神经网络加速器，实现超低功耗、本地化语音识别，支持智能棋盘等设备的‘永远在线’语音交互，显著降低主控负载与系统功耗。
近数据处理（NDP）——GaussDB(for MySQL)性能提升的秘密
华为云官方博客
01-13 1479
摘要：云堆栈的深度集成是释放云数据库力量的关键，华为云在实现这一目标方面处于领先地位，正如GaussDB(for MySQL)所证明的那样。
GaussDB(for MySQL) NDP与PQ测试体验
Enmotech的博客
12-03 739
点击蓝字关注我们GaussDB(for MySQL)发布了计算下推框架。针对数据密集型查询，将提取列、条件过滤、聚合运算等操作向下推送给GaussDB(for MySQL)的分布式存储层的...
IPV6地址格式、邻居发现NDP、DHCPV6、SLAAC
zhiweiaixiaosang的专栏
11-06 6099
IPv6地址 IPv6地址的表示方法 IPv6地址总长度为128比特，通常分为8组，每组为4个十六进制数的形式，每组十六进制数间用冒号分隔。例如：FC00:0000:130F:0000:0000:09C0:876A:130B，这是IPv6地址的首选格式。 为了书写方便，IPv6还提供了压缩格式，以上述IPv6地址为例，具体压缩规则为： 每组中的前导“0”都可以省略，所以上述...
OLAP系统场景中，GaussDB(for MySQL)借助PQ+NDP让性能提升高达百倍
Enmotech的博客
12-30 508
点击关注 · 我们一起过元旦1.背景OLAP（On-Line Analytical Processing）联机分析处理，应用在数据仓库，使用对象是决策者。OLAP系统强调的是数据分析，响应...
近数据处理(NDP)，为GaussDB(for MySQL)性能提升“加冕”
GaussDB数据库
01-12 894
近数据处理（NDP）——GaussDB(for MySQL)性能提升的秘密
def validate_ballots(ranked_ballots, positional_ballots, parties): # Your solution here: valid_rank = [] valid_postion = [] for row in ranked_ballots: if len(row) == len(parties) and type(row) is list: non_zero_rank = [] if not all(r_ballots == 0 for r_ballots in row): num_zero = 0 for r_ballots in row: if not r_ballots < 0: if r_ballots == 0: num_zero += 1 if r_ballots > 0: non_zero_rank.append(r_ballots) exist_rank = len(parties) - num_zero if sorted(non_zero_rank) == list(range(1, exist_rank +1)): ranked_parties = [] for i in range(len(parties)): if row[i] > 0: ranked_parties.append((row[i], parties[i])) sort_rank_parties = sorted(ranked_parties) result = [rank_party for rank, rank_party in sort_rank_parties] valid_rank.append(result) for row2 in positional_ballots: if type(row2) is list and len(row2) != 0: pos_parties = [] for pos_ballot in row2: if pos_ballot in parties: pos_parties.append(pos_ballot) if len(pos_parties) > 0: exist_postion = set(pos_parties) if len(exist_postion) == len(pos_parties): valid_postion.append(list(exist_postion)) return valid_rank + valid_postion 哪里错了帮我修改
10-17
[1, 0, 2, 0], # valid → ["Liberal", "NDP"] [0, 0, 0, 0], # invalid → all zero [1, 2, 2, 3], # invalid → duplicate rank 2 [1, 3, 2, 4], # valid → [L, NDP, C, G] "invalid", # invalid type None...
这是我用自己的风格对你给出的上一道“建造游戏”代码的修改： #include<bits/stdc++.h> using namespace std; const long long INF=1e18; const int M=1000; int n,m,C; int t[55],s[55],b[105]; long long g[1005][M+1],sm[1005][M+2],lc[105][1005]; void pre(){ for(int i=0;i<=C;i++){ for(int j=0;j<=M;j++) g[i][j]=INF; } g[0][0]=0; for(int cnt=1;cnt<=C;cnt++){ for(int sc=0;sc<=M;sc++){ if(g[cnt-1][sc]==INF) continue; for(int i=0;i<n;i++){ int ns=min(M,sc+s[i]); long long nt=g[cnt-1][sc]+t[i]; if(nt<g[cnt][ns]) g[cnt][ns]=nt; } } } for(int cnt=1;cnt<=C;cnt++){ sm[cnt][M]=g[cnt][M]; for(int sc=M-1;sc>=0;sc--) sm[cnt][sc]=min(g[cnt][sc],sm[cnt][sc+1]); } } void cost(int tg,int id){ int req=min(tg,M); for(int j=1;j<=C;j++) lc[id][j]=sm[j][req]; } long long dp[1005],ndp[1005]; int main(){ cin>>n>>m>>C; for(int i=0;i<n;i++) cin>>t[i]>>s[i]; for(int i=0;i<m;i++) cin>>b[i]; pre(); for(int i=0;i<m;i++) cost(b[i],i); for(int i=0;i<=C;i++) dp[i]=INF; dp[0]=0; for(int i=0;i<m;i++){ for(int j=0;j<=C;j++) ndp[j]=INF; for(int c=0;c<=C;c++){ if(dp[c]==INF) continue; for(int j=1;c+j<=C;j++){ if(lc[i][j]!=INF){ if(dp[c]+lc[i][j]<ndp[c+j]) ndp[c+j]=dp[c]+lc[i][j]; } } } for(int j=0;j<=C;j++) dp[j]=ndp[j]; } long long ans=INF; for(int i=0;i<=C;i++) if(dp[i]<ans) ans=dp[i]; cout<<(ans==INF?-1:ans)<<endl; return 0; } 你能仿照这样的风格改变一下这道题的代码风格吗？
10-21
while(va.size() < len) va.push_back(0); while(vb.size() < len) vb.push_back(0); for(int i = 0; i < len; i++) { if(va[i] [i]) return true; if(va[i] > vb[i]) return false; } return va.size() > vb...
void Optic::field_inf() { double x_o, y_o, x_s; double U[FACENUM], U_[FACENUM], I[FACENUM], I_[FACENUM]; double L[FACENUM] = { 0 }, L_[FACENUM] = { 0 };//distance of object and image,and L[0] is zero double rL[FACENUM], rL_[FACENUM];//ideal image and object distance double x[FACENUM], h[FACENUM], D[FACENUM]; double lt_[FACENUM], ls_[FACENUM]; double xt_[FACENUM], xs_[FACENUM], ast_[FACENUM];//variate related to curvature of field /* refractive index of each space(include the object), initial data before each calculation */ double s[FACENUM], t[FACENUM], s_[FACENUM], t_[FACENUM], ast[FACENUM];//variate related to astigmatism double rp[FACENUM] = { 0 }, ndp[FACENUM] = { 0 }, disp[FACENUM] = { 0 }; x_s = 0; U[0] = input->W / 180 * PI; x_o = -INFTY; y_o = -x_o * tan(U[0]); for (int i = 0; i < FACENUM; i++) { ndp[i] = 1; } /* transport data into related arrays */ initLight(d); for (int i = 1; i < input->faceNum; i++) { rp[i] = input->face[i].radius; ndp[i] = input->face[i].n; disp[i] = input->face[i].distance; } /* calculate initial data */ t_[0] = s_[0] = 0; x[0] = x_o - x_s; //take the distance from x-object to x-stop as x0 L[1] = -disp[0]; U[0] = atan(y_o / (-x[0])); rL[1] = x[0] - disp[0]; for (int i = 0; i < input->faceNum; i++) { /* calculate x_i+1 */ I[i] = asin((L[i + 1] - rp[i + 1]) / rp[i + 1] * sin(U[i])); I_[i] = asin(ndp[i] / ndp[i + 1] * sin(I[i])); U_[i] = U[i] + I[i] - I_[i]; L_[i + 1] = rp[i + 1] + rp[i + 1] * sin(I_[i]) / sin(U_[i]); h[i + 1] = rp[i + 1] * sin(U_[i] + I_[i]); x[i + 1] = (L[i] * sin(U[0]) / cos((I[i] - U[0]) / 2)) * (L[i] * sin(U[0]) / cos((I[i] - U[0]) / 2)) / (2 * rp[i + 1]); /* calculate s_i+1 & t_i+1 */ D[i] = (disp[i] - x[i] + x[i + 1]) / cos(U[i]); t[i + 1] = t_[i] - D[i]; s[i + 1] = s_[i] - D[i]; /* calculate s'_i+1, t'_i+1 and astigmatism */ t_[i + 1] = ndp[i + 1] * cos(I_[i]) * cos(I_[i]) / ((ndp[i + 1] * cos(I_[i]) - ndp[i] * cos(I[i])) / rp[i + 1] + ndp[i] * cos(I[i]) * cos(I[i]) / t[i + 1]); s_[i + 1] = ndp[i + 1] / (ndp[i] / s[i + 1] + (ndp[i + 1] * cos(I_[i]) - ndp[i] * cos(I[i])) / rp[i + 1]); ast[i + 1] = (t_[i + 1] - s_[i + 1]) * cos(U_[i]); rL_[i + 1] = ndp[i + 1] / ((ndp[i + 1] - ndp[i]) / rp[i + 1] + ndp[i] / rL[i + 1]); lt_[i + 1] = t_[i + 1] * cos(U_[i]) + x[i + 1]; ls_[i + 1] = s_[i + 1] * cos(U_[i]) + x[i + 1]; xt_[i + 1] = lt_[i + 1] - rL_[i + 1]; xs_[i + 1] = ls_[i + 1] - rL_[i + 1]; ast_[i + 1] = xt_[i + 1] - xs_[i + 1]; /* transmit variable */ L[i + 2] = L_[i + 1] - disp[i + 1]; rL[i + 2] = rL_[i + 1] - disp[i + 1]; U[i + 1] = U_[i]; } this->s = xs_[input->faceNum - 1]; this->t = xt_[input->faceNum - 1]; this->ast = ast[input->faceNum - 1]; } void Optic::field_obj() { double x_o, y_o, x_s; double U[FACENUM], U_[FACENUM], I[FACENUM], I_[FACENUM]; double L[FACENUM] = { 0 }, L_[FACENUM] = { 0 };//distance of object and image,and L[0] is zero double rL[FACENUM], rL_[FACENUM];//ideal image and object distance double x[FACENUM], h[FACENUM], D[FACENUM]; double lt_[FACENUM], ls_[FACENUM]; double xt_[FACENUM], xs_[FACENUM], ast_[FACENUM];//variate related to curvature of field /* refractive index of each space(include the object), initial data before each calculation */ double s[FACENUM], t[FACENUM], s_[FACENUM], t_[FACENUM], ast[FACENUM];//variate related to astigmatism double rp[FACENUM] = { 0 }, ndp[FACENUM] = { 0 }, disp[FACENUM] = { 0 }; x_s = 0; U[0] = input->W / 180 * PI; x_o = -input->L; y_o = -input->H; for (int i = 0; i < FACENUM; i++) { ndp[i] = 1; } /* transport data into related arrays */ initLight(d); for (int i = 1; i < input->faceNum; i++) { rp[i] = input->face[i].radius; ndp[i] = input->face[i].n; disp[i] = input->face[i].distance; } /* calculate initial data */ t_[0] = s_[0] = 0; x[0] = x_o - x_s; //take the distance from x-object to x-stop as x0 L[1] = -disp[0]; U[0] = atan(y_o / (-x[0])); rL[1] = x[0] - disp[0]; for (int i = 0; i < input->faceNum; i++) { /* calculate x_i+1 */ I[i] = asin((L[i + 1] - rp[i + 1]) / rp[i + 1] * sin(U[i])); I_[i] = asin(ndp[i] / ndp[i + 1] * sin(I[i])); U_[i] = U[i] + I[i] - I_[i]; L_[i + 1] = rp[i + 1] + rp[i + 1] * sin(I_[i]) / sin(U_[i]); h[i + 1] = rp[i + 1] * sin(U_[i] + I_[i]); x[i + 1] = (L[i] * sin(U[0]) / cos((I[i] - U[0]) / 2)) * (L[i] * sin(U[0]) / cos((I[i] - U[0]) / 2)) / (2 * rp[i + 1]); /* calculate s_i+1 & t_i+1 */ D[i] = (disp[i] - x[i] + x[i + 1]) / cos(U[i]); t[i + 1] = t_[i] - D[i]; s[i + 1] = s_[i] - D[i]; /* calculate s'_i+1, t'_i+1 and astigmatism */ t_[i + 1] = ndp[i + 1] * cos(I_[i]) * cos(I_[i]) / ((ndp[i + 1] * cos(I_[i]) - ndp[i] * cos(I[i])) / rp[i + 1] + ndp[i] * cos(I[i]) * cos(I[i]) / t[i + 1]); s_[i + 1] = ndp[i + 1] / (ndp[i] / s[i + 1] + (ndp[i + 1] * cos(I_[i]) - ndp[i] * cos(I[i])) / rp[i + 1]); ast[i + 1] = (t_[i + 1] - s_[i + 1]) * cos(U_[i]); rL_[i + 1] = ndp[i + 1] / ((ndp[i + 1] - ndp[i]) / rp[i + 1] + ndp[i] / rL[i + 1]); lt_[i + 1] = t_[i + 1] * cos(U_[i]) + x[i + 1]; ls_[i + 1] = s_[i + 1] * cos(U_[i]) + x[i + 1]; xt_[i + 1] = lt_[i + 1] - rL_[i + 1]; xs_[i + 1] = ls_[i + 1] - rL_[i + 1]; ast_[i + 1] = xt_[i + 1] - xs_[i + 1]; /* transmit variable */ L[i + 2] = L_[i + 1] - disp[i + 1]; rL[i + 2] = rL_[i + 1] - disp[i + 1]; U[i + 1] = U_[i]; } this->s = xs_[input->faceNum - 1]; this->t = xt_[input->faceNum - 1]; this->ast = ast[input->faceNum - 1]; } 根据上述c程序的原理，用python 编写一个计算像散的函数
06-26
初始化数组（列表）：面的数量n=len(faces)我们需要创建长度为n+1的数组（因为从物面0开始，到第n个光学面，共n+1个面？注意C++代码中循环从0到faceNum-1，而faceNum是包括所有面（物面+光学面）的总数。在C++代码中...
现在遇到新的情况 当存在与当前设置冲突的地址时 即使后缀不为1 也能抓到DAD检测报文 同时会打印函数addrconf_dad_failure中net_info_ratelimited(“%s: IPv6 duplicate address %pI6c used by %pM detected!\n”, ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);的这个打印 经查找该函数在下面的函数调用，请分析原因static void ndisc_recv_ns(struct sk_buff *skb) { struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; u8 *lladdr = NULL; u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + offsetof(struct nd_msg, opt)); struct ndisc_options ndopts; struct net_device *dev = skb->dev; struct inet6_ifaddr *ifp; struct inet6_dev *idev = NULL; struct neighbour *neigh; int dad = ipv6_addr_any(saddr); bool inc; int is_router = -1; u64 nonce = 0; if (skb->len < sizeof(struct nd_msg)) { ND_PRINTK(2, warn, "NS: packet too short\n"); return; } if (ipv6_addr_is_multicast(&msg->target)) { ND_PRINTK(2, warn, "NS: multicast target address\n"); return; } /* * RFC2461 7.1.1: * DAD has to be destined for solicited node multicast address. */ if (dad && !ipv6_addr_is_solict_mult(daddr)) { ND_PRINTK(2, warn, "NS: bad DAD packet (wrong destination)\n"); return; } if (!ndisc_parse_options(dev, msg->opt, ndoptlen, &ndopts)) { ND_PRINTK(2, warn, "NS: invalid ND options\n"); return; } if (ndopts.nd_opts_src_lladdr) { lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev); if (!lladdr) { ND_PRINTK(2, warn, "NS: invalid link-layer address length\n"); return; } /* RFC2461 7.1.1: * If the IP source address is the unspecified address, * there MUST NOT be source link-layer address option * in the message. */ if (dad) { ND_PRINTK(2, warn, "NS: bad DAD packet (link-layer address option)\n"); return; } } if (ndopts.nd_opts_nonce && ndopts.nd_opts_nonce->nd_opt_len == 1) memcpy(&nonce, (u8 *)(ndopts.nd_opts_nonce + 1), 6); inc = ipv6_addr_is_multicast(daddr); ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); if (ifp) { have_ifp: if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) { if (dad) { if (nonce != 0 && ifp->dad_nonce == nonce) { u8 *np = (u8 )&nonce; / Matching nonce if looped back / ND_PRINTK(2, notice, “%s: IPv6 DAD loopback for address %pI6c nonce %pM ignored\n”, ifp->idev->dev->name, &ifp->addr, np); goto out; } / * We are colliding with another node * who is doing DAD * so fail our DAD process / addrconf_dad_failure(skb, ifp); return; } else { / * This is not a dad solicitation. * If we are an optimistic node, * we should respond. * Otherwise, we should ignore it. */ if (!(ifp->flags & IFA_F_OPTIMISTIC)) goto out; } } idev = ifp->idev; } else { struct net *net = dev_net(dev); /* perhaps an address on the master device */ if (netif_is_l3_slave(dev)) { struct net_device *mdev; mdev = netdev_master_upper_dev_get_rcu(dev); if (mdev) { ifp = ipv6_get_ifaddr(net, &msg->target, mdev, 1); if (ifp) goto have_ifp; } } idev = in6_dev_get(dev); if (!idev) { /* XXX: count this drop? */ return; } if (ipv6_chk_acast_addr(net, dev, &msg->target) || (idev->cnf.forwarding && (net->ipv6.devconf_all->proxy_ndp || idev->cnf.proxy_ndp) && (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) { if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) && skb->pkt_type != PACKET_HOST && inc && NEIGH_VAR(idev->nd_parms, PROXY_DELAY) != 0) { /* * for anycast or proxy, * sender should delay its response * by a random time between 0 and * MAX_ANYCAST_DELAY_TIME seconds. * (RFC2461) -- yoshfuji */ struct sk_buff *n = skb_clone(skb, GFP_ATOMIC); if (n) pneigh_enqueue(&nd_tbl, idev->nd_parms, n); goto out; } } else goto out; } if (is_router < 0) is_router = idev->cnf.forwarding; if (dad) { ndisc_send_na(dev, &in6addr_linklocal_allnodes, &msg->target, !!is_router, false, (ifp != NULL), true); goto out; } if (inc) NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast); else NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast); /* * update / create cache entry * for the source address */ neigh = __neigh_lookup(&nd_tbl, saddr, dev, !inc || lladdr || !dev->addr_len); if (neigh) ndisc_update(dev, neigh, lladdr, NUD_STALE, NEIGH_UPDATE_F_WEAK_OVERRIDE| NEIGH_UPDATE_F_OVERRIDE, NDISC_NEIGHBOUR_SOLICITATION, &ndopts); if (neigh || !dev->header_ops) { ndisc_send_na(dev, saddr, &msg->target, !!is_router, true, (ifp != NULL && inc), inc); if (neigh) neigh_release(neigh); } out: if (ifp) in6_ifa_put(ifp); else in6_dev_put(idev); }
10-24
sysctl -w net.ipv6.conf.<interface>.proxy_ndp=0 ``` 2. **检查网络拓扑**：排除网络中重复配置的IPv6地址 3. **增强DAD配置**： ```bash sysctl -w net.ipv6.conf.all.enhanced_dad=1 ```
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本文介绍了数据通信的基本概念与关键技术，主要包括： 数据信号分类（模拟/数字信号）及速率指标（波特率、比特率） 两大传输定理：奈奎斯特定理（理想信道极限速率）和香农定理（噪声信道极限速率） 编码调制技术：数字编码（RZ/NRZ/曼彻斯特等）、数字调制（ASK/FSK/PSK/QAM）及模拟信号数字化（PCM） 三种交换方式比较：电路交换（独占线路）、报文交换（存储转发）和分组交换（分块传输），分析各自优缺点 分组交换的两种实现方式：数据报（无连接）和虚电路（面向连接） 文章系统阐述了数据通信的核心原理与技术
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座山雕的博客
12-09 1037
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